The bag bellows is ... a Hefty bag!
Front has movements; rear is fixed.
A true spring back. The wax paper ground glass is taped to a piece of 1/4" plywood with an 8x10" cutout. The distance from the outside of an 8x10 film holder to the film plane is fairly close to 1/4"
View through the "ground glass"
It appears the lens isn't quite centered over the film holder...