It is going to be tricky. A group of us have most of the design and modification work done on the M-56 build and intend to work on the Suomi and Beretta next. Suomi doesn't look too difficult and will incorporate a lot of what has been done on the M56. The Beretta offers some special challenges. Any input is appreciated. There is some discussion on the Weaponeer site on all these builds under specific builds.