I'm looking to to do Van Dyke printing on some of the ubiquitous watercolor paper we have here in the house. The Van Dyke part of it seems pretty intuitive (sensitizing the paper, etc) but finding a frame to do the exposure is a bit problematic. Have any of y'all built one of these creatures? I'd like to make one that can handle from Polaroid 665 size to 8x10 since I plan to (please forgive me for saying the D word) make negatives on transparancy from some of my digital shots for work. Seems to me it could be as simple as a piece of chipboard and thick glass from Home Depot and some "A" clamps. Someone mentioned hinging the back so I can peek at the print, too. Has anyone actually seen one of these frames in the wild? Adorama has them for sale but without pictures.