I will try this:
Will not be for small Hand use, but reducing the drum down to 5 rounds will make 50mm + it pretty Slim for a Cal.68 i still have no good plan for good detents in the drum, Need to think about to get it as cheap and good as possible !
TP(i)X Internals fit well only the mech drum spin could be a bit tricky !?!?!?
Finaly it would be like the HDR Trash one but his bigger and better brother !