@ micr0 I have Land and Sea water brake setup on old home made 12 inch rollers, been mapping cars on it for 12 years, overdue new one now, still using the water brake for now on the new one as it works like a charm for me, new rollers are 20 inch
and back to scans: you need some reference plain or you don't know how much to move it, the origin marks move with the scan,
just tested and you can just move it and do fusion and the origin moves, so you can use a plane for reference then delete it and do the fusion of all the scans, the ctrl key is a very handy tool