> hmmm, I don't think I'd go that way...plywood thin enough to be used for
> a door panel probably would be tough to fasten with door panel screws
> without them working their way out or through.

Originally, Westfalia used 1/8"+- thick baltic birch plywood for all the
interior panels in their camper conversions! It is stronger than masonite as
the plies run in perpendicular directions while masonite has no plies, but
is more like particle board. Westy also used screws w/ little "countersunk"
washers to hold the plywood in place just like vw did in their original
panels. I think Westy stopped using plywood cuz it is more expensive than
masonite-you get what you pay for?

FWIW,

Tom