After looking at all the information listed in the manual section of the early Beaver models I didn't see anything for viewing for my 1990 Beaver Marquis 40 ft. Florentine edition. I have the the owner's manual, electrical diagrams, transmission, and general service manuals for that coach. I'd gladly share the information. Great job of putting all of this together.
Ty Kelly has in his possession an interview video taken with Frank Storch and Jim Hogue taken at BCS.
Also, there is a presentation I did, filmed by Bill Sprague, at rally at Seven Feathers RV Park some years ago.