"Magnusfarce" wrote in message
...
Hi, OP here -

Interesting ideas, but I would like a flat, relatively smooth surface that
would take some pounding (and even some occasional drill-throughs). That
would rule out stone and concrete, and Corian if it's that brittle. I
don't
want treated lumber as a surface, but maybe I can use it as an under layer
with a replaceable top, like masonite. Hmmm.

- Magnusfarce

MDO Medium Density Overlay. This is a plywood like material that is made
for outdoor use. It is used for highway signs. Has a very smooth outer
surface.

Some wood dealers will carry it but it is a sort of specialty item so do
call first. Where are you located? I have a piece 26 x 48 I'd sell for
cost, but I'm in CT.