Here's what I did on the firewall. www.airpartsinc.com has .017 SS sheet 48" wide for 18.95 per foot.. Only 2 feet needed.
Craig www.kr2seafury.com > > Was reading though the plans, and it seems it was supposed > to have cooking > foil thin firewall, .005, gezz that is thin!! No wonder it > peeled off with > my fingers. I'm going with stainless steel at .035 yea a > little more weight, > but this plane is being configured as a single seat plane