I like how this idea sounds. The question is, what would the hardness of the hangers be? I honestly do not think it should be what a permanent field is at. Maybe 1/4 or 1/3 of what is required to take it down. Being able to build inside enemy territory would be neat. If you think about it, there is that risk of having to fly x amount of goons into said territory to drop. Maybe for added zest, the goon pilots would have to get a successful landing message for the SeaBees to keep working (or to fly around for 30 minutes if that's your boat)? So in other words, no "bomb n bail" then 30 minutes later there are 10+ temp bases all over the place. On the ack, I'd bump it up to 3 or 4 to make up for the lack of GV's.
I would also say that such bases should only be buildable in friendly territory and hangars or fuel/ammo/troop facilities destroyed at the base would be permanently gone with no respawn or resupply as an option. These "forward bases" would not be capturable, but rather they would be destroyable.
You'd probably want to require more than three troop transports to build it too.
EDIT:
Or have it be the purpose of specialized engineering vehicles and or Me323s. Take the existing troop transports completely out of the picture.
I think this is the first time I seen you support the Me 323.

But something like this WOULD give the large transports a better SOLID role in AH.
Considering what is being brought up, would 3 323's worth of cargo be considered too much to bring a temp base online? I would rough guess 3 C-47's = 1 Me 323. 9 C-47's (maybe fewer Ju-52's) to bring one of these temp bases online based off that guess. While it may seem a bit harsh, having that ability to bring it up just about anywhere you please, makes up for the effort required.

I can see it now, people NOE 9 C-47's to just outside an enemy HQ's flash range and start making the magic happen. 30 minutes later, the same group attacks the HQ...
