I am updating the current version of gm_disaster.
So far I have made significant progress. I cut 4 MB off of the map size, and 4 minutes off of the map compile time in hammer editor.
The map's terrain is rebuilt, the underground area is fixed, buildings are being edited, some buildings were deleted, and the skybox was lowered.
The compile time in hammer editor was reduced from 10 minutes to 6 minutes. Not bad!
I am planning for more post-nukey featured areas to be added into the map.