Well it also looks very much like the B-17D we've got in the PC Il-2. In fact, given the B-17 descriptions from Joe Baugher's site, (
main,
B-17) it sounds like it is a C or D version, given that the YB-17 is supposed to have a greenhouse turret in the nose, and it's the side gunner positions appear to be flush instead of in blisters. Can't tell if it would be a C or a D though.
On a side note, if it is required to keep the B-17 balanced, downgrading it to the D model might be viable. The D model topped out at about 4000lbs of bombs, instead of the 8000-18000 that later models could carry. It's also a 1941 plane, so it can be used in early war scenarios.