Write buildcubemaps in console. Cool map!
Got stuck:
http://imgur.com/0XYG4DJ
http://imgur.com/fUPt1Jv
Fence go through rock:
http://imgur.com/D8dTYSz
Displacements could use some curves:
http://imgur.com/gNHpKcs
Door clipping the frame:
http://imgur.com/bXfr7EM
You could align the texture with the brush:
http://imgur.com/cZ2B6xp
http://imgur.com/n3p6OVV
TVs disappear when broken:
http://imgur.com/URNDRme
Could add frame to fence:
http://imgur.com/CNssYdR
Add an env_wind to make the dust move horizontally:
http://imgur.com/6zZ5JV7
Almost every prop floats:
http://imgur.com/dnKTFV0
http://imgur.com/MwE93F9
http://imgur.com/Up60OUD
Holes:
http://imgur.com/VF5qQ53
Play with the lighting settings on these fullbrights:
http://imgur.com/Lib5rPb

Optimization:
Use this[www.snarkpit.net] method for cylinders:
http://imgur.com/1IbYvby
The blue lines are your leaves, try to keep them as blocky as possible (use func_detail):
http://imgur.com/CqyM25c
http://imgur.com/r1ausBD