Bread pudding :~)
Hey!! I bet I know what I could do!!
That outside foam insulation paneling...like they nail to the outsides of houses under the trim or brick?
I could make panels that fit that wall inside the shop. It would be enouph insulation to keep the heat in (rather than just the bare metal exterior wall) and would likely be somewhat water-proof. I could just bolt them up, take them down if the area gets wet, let the panels and the area dry, then bolt them back back up!
I bet I could even paint it.