I am resurrecting a project I started on many years ago to make a medium format view camera using 2x3 graflex or Mamiya RB film backs. I have a front and rear standard nearly finished, but need to start working on the frame for a ground glass screen and fitment of the film pack components. With Satin snow now effectively not in business now, where could I get a custom made ground glass with a grid on it from? I know I could make one, but I am trying to keep things as simple as possible.