I too have delusions of a 20x24 camera. I have bellows from the graphics camera we removed from the office with about 6 feet of draw (I work in pre-press), and a 1868 JS Dalmeyer 21x25 rapid rectilinear lens. I have been plannig to use the rails and focusing system from a Burke and James copy camera. I would be interested in a doing folding model though, Jim. I also have 16x20 bellows with a similar future.