Buy a 2x3 View camera with a Universal back, take the front plate off a busted up rb67 and mount it on the front standard, fix up a cocking mechanism for the in lens shutter and go to town. All the great Mamiya optics with full movements. Be aware there are several thousandths film difference between a Mamiya back and a Singer/Graphics back. Might want to modify your GG on the View Camera.
tim in san jose