been coming here to the forum for a few months and finally registered..I posted A question regarding using cellulose insulation for a PC oven..and got A response via e mail..I fully appreciate it, and intend on replying..Just got in from work and too tired to appropriately do so..but will come morning..However I have one more quick question regarding type of metal to use for A PC oven..On the job today across the street the home owner had a new garage door being installed aND I asked for the old one, which was cheerfully given to me.. My main question is..will aluminum garage doors(16 feet long) be okay for the inside and outside walls if properly insulated? I can cut them down to about 5 feet in length, then double them up height wise(if not triple)..fill the already doors with insulation( not sure what yet) then cut more pieces to invert and put over the previously cut pieces to make a 4 inch thick inner wall for insulation..I pretty well like the idea that they are pretty well prefab as far as the thickness, and 2 inch recess on each panel(inverted and screwed together will give me 4 inches inner wall for insulation) and basically attach all my waLLS and roof together saving alot of work..I can also use the track for the automatic door opener with the channel for an already made product trolley to hang it from that will slide in and out to do my baking..Basically..the design is easy…but…Is aluminum acceptable for he inner and outer walls as long as I put enough extra metal sheetrock studs(to make 16 inch centers on the inner framing) then install my insulation. Will the aluminum hold up to 400 degrees with eough inner support and not warp or too much expansion when expanding and contracting? These doors are thickness wise about equal to 22 guage sheet metal…I plan on making an oven big enough to fit whole motorcycle frames in..is the aluminum durable enough to do so(sorry about constant rattling and repeat questions..adhd kinda gets ahold of me sumtimes)Thanks alot…Love the Forum here though..Great peo[ple and alot of good info