Thanks for commenting. I have some modifications to do to make the camera more usable (it's not very stable due to the shape when I rest it on the ground, and it has no tripod mount, which I'd like to add). I have a ton of this velvia left (expiry 1995!) in the freezer, part of the motivation to build this. I do a lot of B&W pinhole with 4x5 but this will enable lots of colour at least until I run out of cheap velvia.
Wow, very nice! And very nice to bump into another color pinhole lover! This is all very good stuff! Thanks for sharing! Wouldn't this make a great Ilfochrome print?