Can I chime in as well here, please?
Just to start with, Odie, Quonset huts are too small to use effectively as a hangar, except for storage. There were a number of "over hangar" types, but none of them big enough to fit a bomber in, only fighters... So are you by any chance thinking of a Miskins Blister (or Over-Blister or Extra-Over-Blister...), like this?
http://www.tep.uk.com/the-blister-hangar-little-sutton/
If you were then there were literally thousands of those around, but usually accompanied by "proper" shed-type hangars such as the B.1, T.1, or T.2.
In terms of fighter groups, not to Orbx quality by any stretch, I've done a bunch of 8th Air Force ones: 4th FG (Debden), 20th FG (Kings Cliffe), 55th (Wormingford), 339th (Fowlmere), 352nd (Bodney), 353rd (Raydon), 357th (Leiston) and 359th (East Wretham). They've been created over a number of years, with varying degrees of accuracy depending on the information and models I've had available at the time. I'm currently trying to make a "proper" Marston sheet PSP runway work at East Wretham, but am having major problems with "Z fighting", where the terrain below shows through the runway object, so right now it's still a FSX default steel mat runway.
They don't, for the most part, have individual pages on my site yet, but they're in the "all-in-one" download - They can be found here:
http://www.ianpsdarkcorner.co.uk/ye-olde-all-in-one-scenerie-downloade-filess/. There's epic amounts that I want to do with my site which right now I can't, unfortunately, so things are just getting done when they get done.
Team SDB (here's a link that may be of more use...
http://www.flightsimstore.com/index.php?cPath=2_82_84_172&sort=3a&filter_id=178) have done a number of both WW2 and Cold War sceneries, but again, they're of varying ages and accuracy. There are also WW2 airfields available in some aircraft packs, such as the FCS Wellington and Hurricane, but they aren't USAAF fields. You will probably also like the Airfield Construction Group freeware sceneries (hosted at the usual two big sites, Avsim and Flightsim.com).
Edited to add: There are other people, particularly Terry Flemming and Terry Boissel, who have also done freeware sceneries, although Terry Boissel's only work if you are using photoreal scenery. I think they both upload to Avsim. There are also a couple of sceneries available here in the SOH library... Ian Elliott I think may be the name behind those? Hopefully he, or someone else, can confirm or deny that!
Hope that's of use.
Cheers,
Ian P.
. Ian's pretty much got all base's (no pun intended ) cover'd in where to look, there's quite a few lurking in the SOH FSX scenery library, you'll be surprised how many there are once you start looking.