Hey, thank you guys. This is going to be a cool little project. Cheap, and even easy with your help. This camera was the first luxury purchase my wife and I made in 1982 after I got my first real job out of college. It pains me to see it doing nothing on the shelf and using it this way makes a virtue of the dead light meter.
One more thing.
To get the focal length, do I just measure from the film pressure plate to the outside-front edge of the body where the cap will be?
would a slide projector or an enlarger work?
I have been practising this with my Canon EOS. I tried using my extension tubes with the body cap on the end and it works like a telephoto pinhole.
I've made a pinhole from a Nikon 35mm body by taking the backing paper from 120 film, taping it over the lens opening in the body and punching a hole in it with a pin. I used 400 speed film and made exposures of 2-5 seconds in sunlight and it worked. Body caps work fine too if you happen to have one, but if not, improvise -- it's more fun experimenting anyway. Have a good time!