[kingbob]

Evergreen do make a corrugated siding that is just right, in 15x30cm sheets, and could use chrome bare metal foil. The styrene and foil sheets are $9 each locally, and to do a side would need 5 or each, 8 total. Thats $150 by itself, so its at least worth looking at a sheet of aluminium. Though to be fair, can glue styrene to minimise the seam before covering it, should be near invisible.

I have seen the Tamiya box sides on ebay for around $30au each, plus about $15 postage, so around $75ish i suppose. That is cheaper, but i'm not equipped to cut them nice and straight. And the join from that would be unmissable. But it is certainly the cheapest option.