Hi Bert and All,
I'm also planning to construct a simple fixed focus camera for 5x7 paper negatives. I can see that ground glass isn't too hard, but I wonder if I can use a piece of vellum or something like that just for one time setting the focus? My idea was to try to set the focus just before I build the back onto the camera ( mine will not take film holders, but will use a clever "storage" compartment that I saw Joe use on F295. I've picked out a lens that might work, but perhaps something simple like this could also be used to check coverage. Anyhow, I'm going to give that a try. Mine will be extremely simple.
P.S. Bert, I was born the same year your Schneider-Kreuznach Super-Angulon was made!