Very nice, all of your cameras. Amazing how the task of attaining a 6x17 negative can result in so many different solutions. Here´s my method, different yet again:

http://www.apug.org/forums/viewpost.php?p=1175693

I had my doubts it would be light tight. But no worries there, it works a treat. The wood does expand and contract somewhat, in tune with the weather, but not enough to prove a problem. Focusing is still spot on.