you mean like the way the ion guys will make mp90's?
I've thought about this and the ion is the easiest market to use in pieces. the SLG needs the frame, or atleast the noid to trip the sear. SO you'd have to make sure everything you look out of the SLG was still touching.
With the ion, the can breech and bolt can sit seperatly as long as the air hose that goes to the banjo is long enough to reach it.