2x3 Crown Graphics are actually lighter than a Mamiya 7IIs and they can do up to 6x9. According to weights I can gather: Mamiya 7 + 90mm = 5.4 lbs, 2x3 Crown with lens and back = 4.4 lbs. The lenses are also much smaller- you could get a 47mm Super Angulon as your wide angle and it's a tiny tiny lens. It's also a much cheaper system to setup than a Mamiya 7II, the disadvantage is you will probably have to do ground glass focusing, and you will need an external meter.