I think that Jackson Center has all of the old plans for all of the old vintage models and you can probably have them fabricate one. I know of someone who lost theirs on the way to the factory and the workmen made them one a couple of years ago. No clue as to how much that cost tho. Maybe someone else will give you another answer.
Welcome to the forums!
Larry and Lou
CP: Water/30 amp/waste dump/WIFI & Room for 2-3 units; PM us if you are headed our direction!
TAC- OH 2
#1420 NOVA 4-006 Charter member