Richard Ritter comes to mind. He made a back for a 7X17 for me. Trouble is these days labor is so expensive you can easily pass up other options in total cost and not end up with much. It cost well over $300 to have a back built. But it made sense for that camera. There are so many great old 8X10's out there for so little $ that you simply can't afford to throw too much $ at yours when you could buy one that will do what you want for less. I bought a dandy old Kodak 2D the other day for $267 bucks. Calumet C1's hover around $400.