I basically like everything in your map, congrats. Nice details too, some of the curves you made are truly amazing !
Though i really don't like the lighting at all. Too many lightsources which disturb each other (sometimes you even have two big lights next to each other which cause double shadows and over-light the scenery (hope you get my point, sry for the lack of proper wording), and the radii are way too high. You know, not everything needs to be fully lit up, sometimes it looks better when there is just one lightsource around which gives light to the surrounding.
That way, you'll get even more of a 3D-effect on all those surfaces and details, and it will look way more realistic and natural.
Imo you should delete them all, and try to only use one sunlight on the outside, and one light each in the spaces or rooms that are in the shadows, if these spots are too dark. Dark spots are not necessarily bad though.
Also there are no additional visible lightsources in the places i mentioned. And maybe it's just me, but i think that if you use a lightcolour which matches exactly to the texture colour, the overall look is a bit...well, boring. How about a yellowish sunlight, like the standard sunlight that one can create from the menu ? This one works very well on almost each texture in sauer and gives maps a more "vital" atmosphere. (Or a darker one, matching to the time of day in your skybox...just try around a bit). You have some nice lighting inside the caves, though. Creates a good atmosphere there.
I also found some noclip-cubes in the middle of the map, with no purpose, and some noclip cubes missing where the "stop"-sign is...you suddenly stop there when you move at the wall (it's a small piece of wood that you just forgot to noclip - nothing serious though). Maybe you check that again ;)
The shells and one of the playerstarts (didn't check them all) are floating a bit high over the ground, especially for the shells it looks a bit strange.
3/5. (Because of the lighting) :)