Garage door realizable identically - What material is this?

Hmm, honestly, I don't see any obstacle right now why I shouldn't be able to screw that onto my normal sectional door from the inside...? If it’s black, it looks exactly like in your picture. Only at the ends would one have to work precisely to ensure the extra improved sealing I have. Otherwise, only the weight is a sticking point, but I think I could manage that.