Quote Originally Posted by Nicholas Lindan View Post

The bread truck camera, if it took 3x4" film (guessing at its size) would need a focal length of 2.5" or so; instead it looks as if it may be 6" - more suited to an 8x10 camera.

Using a long focal length is equivalent of blowing up the central 1/6 or so of the negative to make the final print - not a good thing when you are starting out at fuzzy.
It's a decorative tin - and the body where the pinhole and paper sits is about 3.5 inches long and the paper is around 2.5 inches wide and approx. 3 inches tall.