They are wild planes. Yep, I did one in the Valkyrie package.
If you ever see the documentary on Discovery of the 300 series, from glider to powered transport, watch it! Its brilliant.
The troop transporter had two levels for soldiers to sit in, and then the command deck or command cabin on the very top. By the way, a ladder to the top command pod got you up there. Within that area, you had the pilot, co-pilot, then an engineer in each wing root (each side, sitting back inside the wing) in these little cubicles that had tons of levers and gauges for monitoring the 6 engines. Each engineer watched his set of 3 engines. The Engineers also had a neat little window hatch in the top front of the wing so they could look out during flight, and also get out on the wing when they had landed.
A famous story; a unused 323 Gigant wing spar (massive structure) was used as a bridge in a small village over a river, and still stands today if I am correct.
Now.... for the imagination. Imagine such power of those 6 engines, bolted to a gigantic glider the size of a small zeppelin, and take off with 'zero' payload and say half fuel. That would be a wild ride, lolol....
EDIT: On mine, its not the greatest. I had made several versions for AI traffic in WWII Germany and ended up giving it a VC and it became a functioning plane and included on the missions lists.
Bill