Polaroid 20x24 info
Mr Falkenberg has contacted me and I will help him if I can.
As far as info on the web goes, it's not possible for the uninitiated to know the proper information from the mis-information, which seems available in much greater quantities.
There are a number of really good looking home-built cameras in a variety of sizes on the web, in fact, right here on APUG.
There are no plans or blueprints for Polaroid processors, Wisner reverse-engineered his from an existing prototype at Polaroid.