DJMTruck: when I bought my AD 100 years ago it had no door panels nor frames. After reading all the posts about the problems with replacement cardboard panels I did something like marzach submitted, but with a twist. I bought myself some replacement stainless steel frames from one of the vendors and used them as templates for panels I made from light gauge sheet metal. I then covered these panels w a fabric of my choice from Joanne Fabrics and glued it on w 3M Spray Adhesive as listed above. My completed panels then fit nicely into the grooves of those SS frames. Nice thing too about making them from sheet metal is you can bend the metal panels then to follow the slight contour of the frames/doors and it holds its shape: forever. Took a bit of work but, if I can, I like to do things right the first time.
Good luck, Dave