[X. Phot.]

8x10 is a good size. Contact prints from that size are respectable. Optimally if you could acquire the 8x10 film holder, you can design your camera around it. A simple lightproof box used as a single-shot camera could do this job also. My experiments show if a 2x yellow filter is used for contrast adjustment, normal RC VC paper, fl=14"-15" or so, pinhole ~ .65mm, on a bright sunny day you could expect exposures of 6-8 minutes or even longer. Having a camera that is solid, and that doesn't move around in a breeze is important.