This map is almost releasable, the problem is those waterfall/pool things. They simply need to go. I would remove all use of water EXCEPT for that water under the broken bridge. Otherwise, think of replacing those waterfall/pool thingies with zen gardens or something. That would get this map closer to release standards performance-wise.

Very interesting map. I once wanted to make a map with a similar theme but that never happened.

Content
The screenshot looks pretty good, but you it shows off the lighting isn't that great yet. Also, don't use the .png-format as screenshot for loading the map ingame, as only .jpg-format is supported.
Be sure to remove the .DS_Store and "_MACOSX" folder, as other people have no use for it.

Theme
The theme is very original, it reminds me of the map Japanese Castles (which may be not compatible with Sauerbraten, it still looks and plays great).

Texturing
The texturing seems to be pretty good. There have been used a lot of textures which fit each other very well.
I still would advice you to use textures which are really from 1 texture-set, as the "gibbie" textures are looking odd against Cube 1's diffuse textures.
I'm getting a warning 4 times which is:
"Warning: too many textures in textureslot 975". use "texturereset" in your config-file before defining all textures. You probably messed up texture-blending?
Also receiving the error:
"Unknown command "texgrass".
Try to use "autograss" instead, it could help.

Geometry
The geometry is done quiet good also. Too bad the map counts over 190k of world triangles, which is a lot (it's 161k of wtr in SVN-version, still incredibly much). What about making the pillars and fences having less triangles? I think that would matter a lot.
Also, putting the sky-texture on the outside of the mountains (which shouldn't be seen by players anyways) can save up like 2k or 5k of wtr.

Lighting
The lighting isn't really bad, as the brightness seems to be fine. Some light entities are just having a very odd colour (like the "222 96 64 32" light-entity).

Detailing
There has been added pretty much details, which is a pluspoint to me. But I still think you could add even more things, like as eihrul suggested, a zen-garden, but also making the walls of those houses appear like been made of rice-paper (or what kind of material they use to make indoor walls back in those days).
There are 2 torches close to a fountain, which should be turned 180 degrees.

Clipping/Noclipping
You've tried to add walls of clip to keep the player inside the map, but failed. Players are still able to run just between the clip and the mountains, right behind both buildings which are containing the flags (and also next to those buildings). Be sure to let the clip go through some parts of the mountains also. Be sure to add a ceiling of clip also, as players still would be able to grenade- or rocket-jump over the walls when they have a quad and YA (which the YA is still lacking but I would suggest to add it).

Flow
The flow seems to be ok. There have been added plenty of layers in platforms and rooms which are connected to each other.

Gameplay
The gameplay seems to be pretty unfinished. There are only 2 ways to the flags, which are doorways that are positioned perfectly next to each other. This makes it very easily to defend the flag, as you wouldn't get shot in the back anyways when you would strafe around close to your flag.
What about adding a way from the roof to prevent this? You would only have to make 2 different ways to the roof and enlarging those windows. A balcony wouldn't be a bad idea either.
The pickup placement is still lacking a lot. The amount of pickups is way too low for 32 people. It wouldn't be enough for even 4 people. Be sure to add a lot more pickups than what's appearing now.
Having 16 playerstarts each base isn't enough for 32 players either. Be sure to add at least 48 playerstarts to have some more randomness in spawning.

Overall
The map seems to look pretty good from the first sight, but still needs several improvements before it really can be played. Keep it up though! I'll rate 7/10 for now.

Thank you for the suggestions. I constructed balconies on the exteriors of the flag rooms so that players can bounce through a back door via a jump pad, and the fountains are being replaced with zen gardens.

I will work to implement the other suggestions into the map.

I like the asian theme as well and thought about making a map like this several times. The flow is quite good, but you should think about nocliping the windows for more variations in the gameplay. I noticed, that the flags are floating and the clip isn't finished yet. Even if you added a lot of details you may work on the walls of the houses. I like Suicizer's idea of ricepaper-walls. Try to arrange the map very realistic and detailed, cause that fits perfectly in the chosen theme.
The map got a good layout and a manifold theme. If you work at the realization of your idea's it might become a very good map. I guess you got some helpful suggestions in the comments and I would like to see a revised version soon.

Maybe you could add a few bases for regen capture mode? I can imagine it would work good. Great map overall.

Update 1, see change log above

how about some playerstart 0 (maybe even capture bases)?

the map is awesome, i like it. maybe clip the deformed stairs.

one more thing, the map could benefit from some blendmaps, like at the natural stairs

very nice, idk, but maybe you should add some kind of cool gift inside the big water pool (Healthboost or Quad) in the middle to give it a sense (except for looking good).

Here a quick review of what could be improved or fixed:

Content
The "hidden" folder isn't necessary in the zip-file.
Theme
What about marking the theme even deeper into the map? I'll take the japanese castle as example again, as it shows off some nice details which could also be made in Sauerbraten.
Some more screenshot of the map are available just right under this line of text (seems it can't be posted as a link, just copy-past into your webbrowser).
http://quakelive.wikispaces.com/Arena+-+Japanese+Castles

Texturing
- Viruz commented already about the texture-blending-part...
- Nice to see you've putted skytexture on some sides outside the map, but you have forgotten 1 line of mountains at both sides of the map.
- Well, because I made a typo in my first comment, I'll fix that in this one. I still would advice you to use textures which are really from 1 texture-set, as the "gibbie" textures are looking odd against Cube 1's diffuse textures.
- The roof-textures, looks pretty odd to me (as the "2_256_red_thin02" is commonly used as a trimming-texture).
Well, it's probably just a matter of taste on that part =P.

Geometry
- The "Japanese triumph arcs" on both sides of the map, contain some geometry mistakes (compared to those in the zen-garden).
- The roof at both sides of the bright is containing geometry mistakes compared to the rest of the bridge.
- Be sure to hunt around the map for geometry mistakes, as they can change the look of a map and often decrease the world-triangles a bit (which wouldn't be bad for this map, still 160k+ of wtr).
- What about replacing the arrowheads" on those roofs for a more cheaper design? People wouldn't see them from close anyways, so that shouldn't be the issue. I think if you would replace it for "just a steep pyramid on a stick" would do the job just as well.
- The rock just outside of the upper zen-gardens seems to be very unnecessary detailed, as it still looks very blocky. When making things like rocks/mountains/hills/etc, try to keep the gridsize just 1 smaller as the default gridsize at least. Any bigger gridsize is only providing profit (of course don't take a too big gridsize, find yourself a balance. I often use 2 or 1 gridsize bigger as default)...
- Take a look on the mountains, as they still contain a lot of geometry mistakes.

Lighting
- The lighting seems overall ok, but there are many lights which are emitting a HUGE amount of light compared what they actually are. The lanterns at the zen-garden are a very good example of that, you barely see any of the light which the torches are emitting.
- Be sure to check if light-entities aren't over-multiplying each other (like which happens in the zen-garden).

Detailing
- What about adding details like a samurai sword on the walls inside buildings and such? Be sure just to Google some old Japanese habits and implement them into the map if possible.

Clipping/Noclipping
- You did some nice work here, good job! Really nice to see that.

Flow
- The jumppad to the balcony should be set more vertical, if you run into the jumppad and are aiming to the balcony, you'll have a nasty face plant just right above the doorway. Keep in mind, players will be running already when they enter the jumppad, so they won't just stop pressing the forward-button to land gently.

Gameplay
- Be sure to add GA too, as people shouldn't go fight for the YA and Quad only (as it would kill the intention of being a capture the flag map).
- I don't know how much experience you have in placing pickups and creating a good gameplay, but be sure to add more grenades and less bullets, as there are only 12 grenade-respawnpoints, while there are 36 bullets (!) spawning on the map.
- Putting 4 grenades pretty close to each other isn't a very good idea, as it provides spamming the grenades. Be sure to spread them out some more, instead just 2 on each side of the zen-garden (which isn't a bad place for grenades though).
- The number of playerstarts aren't equal and the map isn't containing a playerstart which has been set only for Deathmatch, Capture or Hold. So 1 base has 1 more spawn?
- Be sure to use "entselsnap" for positioning the flags, as they are placed pretty random now (it's binded on "6" as shortkey in edit-mode).

Overall
- You did a fair job just so far on improving the map. Waiting to see even more improvements ^^!

Update 1.2 out

Awesome map, the first map that got the japanese theme right, using the standard textures which is amazing!