Can I ask why you want it to be so tall? Just curious....

Getting PVC sheeting from Home Depot or a sign company and building it wouldn't be that difficult. Tracks are easy to come by, and if you have a local source for glass doors, you'd be set. Ordering glass doors for something that size will get pricey. You could use Lexan or something similiar, but it will get scratched or warped over time. Heating it could also be a PITA... unless it's going into a warm room.