What gauge steel is used for unibody floorboards?

i just recently posted a question about using fibergl to repair the floorboards in my 82 camaro and my thought that it wasnt a good idea was pretty much confirmed. ive seen posts saying to use 22 gauge steel to fabricate patch panels. my question is does anyone know what gauge the actual floor pans are made from because i got hold of some 22 gauge steel to use and it seems rather flimsy for what im intending to use it for. any help would be greatly appreciated