Thanks guys!
Out of curiosity, what made you settle on 6x17?
I really like a panoramic format, but haven't shot one but for a few outings with a paper negative pinhole camera a few years back. The camera just became a pain to use, so I didn't end up shooting it much. I initially thought I'd do something like 6x24; I'm not sure why I decided against that.

I started the build to be more like 6x18, but placed my film rails such that the outer edges made it 6x18, so the image is slightly smaller.
Oh, and here's a photo of the inside for anyone interested.
P1020101 by
jason_in_gboro, on Flickr