For months I've been thinking of doing a similar "adaptation" with my cameras, but one thing is stopping me (besides laziness), and that is I am not sure how to rig up the negative carrier. Would a store-bought one need to be hacksawed down? Would 2 pieces of glass and tape on one edge work as a carrier, or would I be in Newton ring hell? How about a modified picture frame? I thought about sacrificing a film holder but the resulting rough edges would be a disaster in the making.