Where can i get ribbed aluminium or steel sheet?

[kingbob]

I had worked out pricing for using Evergreen sheets, with bare metal foil, but that worked out at close to $200.

However that was using multiple 15x30cm sheets. I've just discovered that Evergreen do the corrugated pattern in 30x60cm sheets. Only need 2 per side, would 1 seam in the middle which once glued and backed could be made nearly invisible.

I suppose I could just use silver tape. I have a roll at home that is used for taping around aircon ducting, was pretty cheap. Be a pain in the backside to cover 2.5mm corrugations, but not impossible.

The 30x60cm sheets are about $45 locally, but have seen them online for $17US. So $68+postage, and a $5 roll of chrome tape might be the way to go.