The camera is home made from black foamcore, it's about 5x6 on the outside, and 160mm focal length. The backs are hinged, the pinholes are cut from .002" thick brass shim stock mounted on a black matte board disk. It allowed me to make something that looked good from the front and kept the pinhole distance calculations simple. I'll post a photo later.

The pinhole was cut in the usual manner, poked with a pin, then sanded and rolled to size. I tested them buy holding the pinhole up to my eye, tuning it into a small camera obscura. This confirmed that they were round, not egg shaped, by my best measuring I think the pinholes are around .003" diameter.