I might be wrong on this, but I think all you'd really need would be a PPSH, a new barrel shroud, and some sheet metal. What I'm thinking is this (considered it for messing around with a Cybergun Thompson): keep the standard drum mag, but fabricate a new feed system. Rotate the drum 90° clockwise and put a chute on it, shaped to fit the mag well. Only problem would be feeding it to the chamber. Plus, it wouldn't exactly be a perfect reproduction, but it could definitely look close enough.
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