Well I can give a couple of critiques offhand on KSMAP_01
1.) Try to avoid diagonals as much as possible It makes lining up textures a pain and unless there's a need for it it can look messy and unorganized.
2.) The skybox has the F_SKY1 texture within it. The skybox is suposed to project onto F_SKY1 so this is redundant.
3.) Try to keep areas for the player to navigate larger than 96 units wide. At 64 it's very narrow and can make navigation difficult.
These are just my opinions so take them for what they're worth. Except #2, that's actually broken
Other than that it looks like a good start so keep it up.