I'm simply baffled.
http://p3d.in/TImWj/
And yes, the bottom ones do rotate. Not entirely sure why you'd want them to, but there you go. (The hinges on the side flaps in p3d are misplaced for some reason, but they're fine on the actual model)
Thanks for all the feedback so far! I did a check, and it looks like I'll be able to fit a pilot and WO into the cockpit comfortably if this thing is 70ish m in length. Still pretty large, granted, but it also fits with the rest of the stuff in my universe, and is comparable to some of the larger custom bombers around here.
As far as functional things, looks like I still need to model in a rearm bay, landing gear/skids, countermeasure launch port, docking pylons, secondary logistics hatches, and an entryway. Perhaps I should make the thrusters variable geometry..