Patrick,
Found https://aircorpslibrary.com website with factory drawings and various manuals on 48 aircraft. For the B-17, see the following drawings for details:
65-3543 Control Surface INST (Stabilizer & Elevator, early)
75-3297 Elevator ASSY (early)
15-7022 Diagram Stabilizer & Elevator (E-G)
65-3286 Diagram Fin & Rudder (early)
8-720 Fuselage Jig (early)
14-2042 Fuselage Jig (E-G)
49-2301 Centerline Diagram Landing Gear
unknown p-507 Diagram Landing Gear (YB-17)
unknown p-505 Nose Canopy (YB-17)
15-3421 Fuselage ASSY (YB-17, A)
65-3421 Fuselage ASSY (B-D)
15-7330 Fuselage ASSY FWD Section (E-G)
15-7331 Fuselage ASSY Rear Section (E early)
65-7331 Fuselage ASSY Rear Section (E-G)
75-3545 General Arrangement & Final ASSY (early)
15-6712 General Arrangement & Final ASSY (E early, F & G)
75-3590 Wing Tip ASSY
15-7975 Wing ASSY Inner
75-4771 Wing ASSY Inner
75-4772 Wing ASSY Outer
Another website is https://airwingmedia.com/ where one can get the B-17C Flight Manual, Oct 1940. The B-17 collection includes 17 manuals and 21 magazines (Wings & Airpower).
Comparing DWGs 15-7330 & 65-3421, I see two extra sections, each 9 11/16 in. wide, about 0.61 in. section removed in 32nd scale. Koster asked for 3/8 in. cut, about 0.56 in. in 32nd scale. To allow for two sections between wing and crew door, I'm thinking 0.58 in. (14.8 mm) section removal would be okay.
Comparing DWGs 15-7331 & 65-3421, you cut along Frame 6 while leaving the wing fillet TEs. I think you will have a better aft fuselage than mine. Koster's 1/2 in. cut aft of Frame 6 cleared the wing fillet TEs. On the HK kit, there are three rivet lines aft of Frame 6. A cut between the first and second rivet lines would clear the wing fillet TEs, but the forward edge of the rear crew door may not be proper. Using a 3D-printer would resolve this dilemma.
Can you tell me the DWG number showing the pilot cabin seat arrangement? I'm having trouble inserting an image.
kwl_12_1949@att.net