I did that quite a few years ago Kerick, I had a walk-around/through a B-17 and a CASA 2.111 (He111 powered by Merlins). I couldn't imagine trying to walk across the bomb bay walkway of the B-17 with all the gear on while it's maneuvering all over the place, but when I went through the CASA, it's even less space, to get to the front or go to the back, you have to crawl over the bomb racks, where the bombs are all stood up on end in square chutes. There's barely any room between the top of the fuselage and the tops of the chutes.