Visually speaking it looks awesome. Really nice work.
Since I'm working on CS maps too, I have two points to talk.
I hope it could help you.
1- In my view, you should remake the layout inside the shed. It's too simple and there's one easy access to the red flag.
http://img149.imageshack.us/img149/1541/imagexw3.jpgThese thin polygons are a really bad solution. I got stucked on it two times and they're also very close to the backgorund.
2 - You should put more transparency for some sceneries which are in the back. The css_sciana3 sceneries inside red base and that brick building on the left of red base should be a bit more transparent and that scenery on its top as well.
Bye! And keep this work.
sorry, bad english... I don't know if spawns in both sides will work, 'cause it's a ctf map for soldat, but I'm not sure since I can't play in CS servers very much.