"Ben, yes this is quite late but you might also want to consider a Boland style collapsible basket.
Mine is 28"x44", carries 2-3 people inside w/ the tanks secured externally and weighs in at a total weight of 225lbs with…"
hey, sorry i coldnt get back to you on chat. i got my fabric from an old '89 balloon works envelope, but you can find any old, cheap, un airworhty balloon to make a model out of. your other option is to contact a major balloon manufacturer and get scraps from a factory. or just buy some.
www.noahlamports.com or go to ur repairstation and ask if the have any that u can buy off of them. the stuff at the joanns or local fabic store with burn up it does not have the coating like big balloon s have pluse it will be really heavy . but this is my opain