Why is the map called Chambord2 when Chambord was never finished? Just because the first map was scrapped doesn't mean the name had to be, too. Just seems kind of strange, but your call.
The brushwork seems really haphazard, though it looks like beta2 cleaned that up a lot. I'd look into using clipping planes for the rocks. You can create pretty decent stuff with minimal effort that way.
There are some areas where you can see through the sky to other parts of the map, which looks bad. Need to do something about that.
The spiral staircase really needs to be re-done. There are a bunch of floating boards and it just looks sloppy. BSP has a function to create spiral staircases, so this should be trivial to fix.
(First screenshot) With the changes in beta 2, the r_speeds shot through the roof. At its current state, the map will be unplayable on many computers. (2nd shot) Even under the base where there's not much of anything visible, the r_speeds are pretty high. I'd suggest doing away with the reflective water there. Perhaps bring the water level all the way up to the ceiling so that the water surface isn't visible, or find a way to block that area off from the outside so it's not trying to render reflections of the whole map.
(3rd screenshot) Something weird is going on inside the base. I'm not sure if you just used a whole bunch of little brushes somewhere or what, but it's split to hell. This is part of what's hurting your r_speeds.
The rungs of the ladders need to be made less thick, and the texture needs to be rotated to go along the length of them. Wouldn't hurt to make the sides of the ladders less thick, too.
I don't really like the wood with haphazard nails textures, especially covering a large surface area since it doesn't tile well. I'd suggest using something different.
There's not anything supporting the upper floors -- just a thin layer of bricks jutting out from a wall. There's no way a structure like this could stay upright. It needs some arch supports or something to help the believability.
I've put the map up in rotation on the beta server for testing.