I am writing an alternate WWII story, and I was wondering if you fine fellows on this site could help me. I am trying to make a fantasy bomber version of the USN Boeing C-98 Clipper, AKA the Boeing 314 Pan-Am Clipper flying boat. My idea is that the Navy ordered more C-98's as new builds after being impressed with the performance of the Pan-Am craft, and a bomber variant was developed.
So, were there any WWII era flying boats that had internal bomb bays? The German Blohm & Voss BV 238 is listed on Wikipedia as having 'wing bomb racks' and 'external racks'. The later jet powered 1960's Martin P6M Seamaster has an internal bay, but could that have been done back in WWII, or was the technology to keep the doors sealed when the craft was sitting on the water not up to par in the 1940's? Could they have used something similar to torpedo tube door seals from submarines?
Could something like this have been done with the hull of a modified C-98 design, or would it not be feasible with 40's tech?
Also, how would turrets be laid out on a flying boat? I'm thinking this craft is a long-range strategic bomber like the Flying Fortress, but I think belly turrets would probably be out of the question if this thing is going to land on the water. Would it have low down turrets on the sides of the fuselage to attempt to compensate for this?
Thanks in advance for any help.