I played the most recent version of the map. It's pretty fun, there's lots of room to jump around and it feels fluid. I especially like all the low holes in the walls that you can slide through. At the moment the map is really blocky and I'm not sure how much you are planning to detail it, but some cool columns and stuff could look good, and aren't too complicated for bsp:http://thumbs.dreamstime.com/x/old-anceint-roman-stone-columns-isolated-27131772.jpghttp://www.classicpartyrentals.ca/wp-content/uploads/2012/07/Columns-RomanStone.jpg
Maybe have a look at the ones in da_sacred - you can get the vmt here
if you like.
Also the doors might not lag on your local machine but in a multiplayer game they start to lag really fast. I suggest changing them to static doors and using them to guide the players into the doorway. It kinda sucks to lose the physics hinges but you can make up for that by putting more detail on the door since it's not going to move. Read more here
I'd like to see you try your hand at some more detailed brushwork. You have a solid layout but if you really want to push this map you should think about some ways to increase the detail in the BSP. I'm thinking things like broken walls with the bricks falling out, wooden catwalks coming out of the walls and all the wooden supports you could make. Wooden and brick stuff is great because nothing's cheap to render like a cube. You can make each plank in the whole catwalk and the detail looks great. I've been playing some Fistful of Frags and they do that in their maps. You should check that game out they have great bsp.
Another way to increase detail on your brushwork is with displacements. Not only do you get the nice organic-y mesh but you can paint textures onto the surface. This is handy for stuff like cave walls where the rocks change texture gradually, but I'm thinking for players pathways you could make a dicplacement that has a slight depression along the players path, and then fade from a dirt texture in the path to a stone texture on the sides.
Looking good so far man, keep up the hard work!