I just got in from the auction site an Argus 21 that really needs a re-covering. The existing leatherette is peeling badly, but in unbroken pieces, so cutting templates shouldn't be too difficult. I just might redo it in veneer just for the heck of it.
I suggest leaving about 1mm on all sides of the teplates. Leather is a bit stretchable and wood isn't. After the slightly larger veneer is cut, you can test fit it on the camera and cut off the rest. Good luck and have fun with the redo.
The pencil-rubberband glueing technique is not pattented. You're alowed to use it if you want.