Since this mod runs on the Orange Box Engine, and EVERY game in the Orange Engine doesn't work in the Source SDK [Except TF2 but we're not modding that!] editing doesn't work.
I can't modify the map [I can JUST do it however], I accidentally deleted a scenic building and I can't replace it until SDK is fixed. Actually, to be honest, I believe ac_p1 (the first level in this mod) would be conceptually done.
As in, you would be able to go from the start, to the end where the next level loads. It wouldn't be done but it'd be visually done.
So yeah, Valve has set me back with this update.
Look out for updates once it's fixed however :P