I don't have them anymore. When I started, I just got a teardrop shaped beanbag chair from Meijer (a midwest chain), cut it up at the seams, and used them to create the patterns. Did a couple prototypes with some inexpensive canvas from Hobby Lobby before I moved on to Sunbrella and 500 denier (I think) Cordura for the bottoms. The cheap ones from the store has some sort of a white liner in them, but I didn't bother with that. The only part I found tricky to sew was where the side panel met the front panels at the very top of the seat, because of the stiffness of the Sunbrella. Although that didn't seem to give the Amish any trouble.
Interesting side note: The Amish worked out in sort of a barn structure on Consew Model 206 machines. Mostly women, in Amish garb, singing hymns as they worked. So how did they do it without electricity? They had a diesel powered air compressor and tank with compressed air lines running to each of a half dozen or so sewing machines. Then, in place of the usual clutch pedal arrangement used on an electric motor powered machine, they used their feet to activate the valve for a compressed air powered motor. Instead of the constant whirring sound of the big motor on an industrial machine, it would be dead quiet until they pressed the pedal, and the pdddddffffft.