[Porsche-O-Phile]

Is it holding up okay? Most of the spray-on foam type insulations I've seen tend to flake off and/or fall to the bottom after a while. If you packed it in there between the ribs and then screwed gyp board onto it it'd probably be okay... You'd have to make sure you had good vapor control on the inside so you didn't get condensation on the inside of the metal skin though or it could start rotting the stuff out.

Just curious. Another benefit I suppose is termites don't eat metal (but again, if you detail it properly they won't get to your wood framing either...)