This tank town is not invulnerable to air attack, it just means a long climb, coping with heavy AA over the crater and bombing through cloud if you want to hit the V bases. The tank town itself has no cloud cover. Three jabos could still close a V base if they really wanted to. Its not exactly uncommon to find jabos hitting fields from 15K approaches in the MA now.
If HTC do object to this setup it is no big deal, I can remove the flak towns or cloud cover in just a few minutes. I could also put three gaps in the crater rim, which would then be obvious ambush places for any fighters capping the tank town crater.