Gosh, Bish, you were quick. If all Her Majesty's soldiers are that fast, Britain's enemies need watch out.
Here are references I used for the exhaust staining. First, about the only one I could find of the undersurfaces.
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The next two are top views.
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In doing some research, I ran across an opinion that the exhaust stains ended where those eight squarish ducts began--because these ducts vented the wing, they (supposedly) blew the engine exhaust away and prevented staining at the trailing edge of the wing. I think the above photos show that the engine exhaust could and did extend to the trailing edge, at least sometimes. There is an overhead photo of "Knock Out Dropper" where the exhausts seem not to have stained beyond the eight ducts, however.
You're fortunate to have all this 8th AAF stuff so close. These are places I'd like to see, if I ever make it to Blighty.
The kit is the 1:72 offering from Airfix (reboxed from Academy)
I added the Squadron waist windows by first positioning them and taping them down, then I ran a line of superglue (CA) at the top and the bottom, from the outside. (Photos show these windows where installed from the outside of the fuselage--which makes every earlier time I've used them on kits: wrong.) Then I sanded that smooth. I used diluted white glue to fill in the sides of the windows. It can be nerve wracking to install these, since the tendency of the CA is to be drawn into the window by capilllary action; too much, and it will overrun the clear parts of the windows.
Squadron makes a set of windows including the three-piece waist positions specifically for the old Academy kits--but they are way too small for the fuselage openings. Be sure to use the Hasegawa-designated windows from Squadron. They are big enough to work.
Is that "Rabbit" or "Super Rabbit?" Hasegawa put out a G with "Super Rabbit" markings. I haven't built it yet, but you maybe should be sure to check sources. I'm not sure, but if it is "Super Rabbit," that might be late enough in the war to have the single window waist position. I was surprised when I found a starboard aft photo of "Fever Beaver," whose markings are contained in the Airfix release. She carried staggered waist positions and the one piece waist windows. I have one more Airfix Fort left, and when I build it, will probably do this craft.
As for the front page, the two earlier Forts I did were both from the 91st BG, based at Bassingbourn.
Thanks for your kind comments. Again, it was a great group build.