Maybe it's just cos I don't know how to use winrar right but put files that rar contains only maps, textures and scenery-gfx directories, not ctf_Sandstorm directory. So it would be thousand times faster to unrar to right directory.
When you put the flags at top of map and you don't have roof, what's going to happen? BOOST BOOST BOOST, the bottom of map doesn't have use then.
Anyway otherwise map looks nice. Add roof or make new flag place at the bottom. I recommend the last one.