Great improvement from your original drawings, major kudos and props to you.
Unless its been researched and some examples shown, I don't think a u-boat could handle a MG-42 in the tower mounts; the amount of recoil those guns produce is enormous. In the field they would frequently have to rely on just bipod mounts on the end of the barrells; but that didn't really steady the gun like a proper tripod. Tripods for a MG42 were quite a bit more heavy duty than their American counterparts of the time (mostly .30 cals) and were more of a platform that the entire gun sat on rather than slid into like a tripod mount. A true MG42 mount looks almost like an expanded set of billows; plus you had to keep spare barrells for when the ones in place would (inevetably) overheat.
MG42's could easily be adapted to any of the flak platforms (in place of whatever gun might be there) though would be tough to simulate the heat built up on in the barrell, or switching them out.
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