I still photograph with a Linhof Technika II 13x18 (5x7 inch) from 1938 and needed a lens board for a Schneider Angulon 120 mm lens. I found nothing on ebay or elsewhere. Yesterday my son modeled it for me in Rhino, today a friend printed it for me with a 3D printer (Makerbot).
Lens mounted, everything fits perfectly. Old technology meets new technology. Perfect.