In a message dated 8/15/05 4:42:50 PM, wil@CHARMFX.COM writes:

<< I would think thin sheets of Masonite (brown pressed paperboard,

available at Home Depot) would work. >>

As long as it is tempered hardboard.  Tempered hardboard is classified for
exterior use.  The best tempered hardboard I have found is commonly called
"screen-back" due to the pattern embossed on its reverse side.  It is stiffer,
flatter, denser and the face seems to be much harder (wear resistant) than the
run-of-the-mill variety.

Judging by what I see on "American Hot Rod", those upholstery guys seem to
like Luaun plywood for their panel work.

George