An older gentleman at church who was a paratrooper and who jumped from C-47s and other aircraft told me the C-119 had one factor that endeared it to paratroopers - and probably to their unit commanders as well. Due to its design it eliminated the need to make a 90-degree turn at the door just before leaving the airplane, as in the C-47, C-46, and other aircraft of the era. In the -119 you just stood up, hooked up, had your equipment checks, then stood in the door - and it was possible to practically run out the back end since the two personnel doors that were toward the back of the fuselage allowed the static line cable to go straight to the door frame, thus eliminating that turn at the last second. The big issue after that was making sure you didn't land in the canopy of the guy who jumped in front of you.
I'd bet this made it a little easier to assemble units on the ground since it was possible for everyone in both sticks to leave the aircraft in a very short period of time and thus, if the wind cooperated, land pretty close together.
It's a well-known bird but very, very little has been done in the FS world to provide a good model. Like you I am looking forward to this one.