This is a 4' x 6' sheet of 2" thick polyfoam board. I painted it
with a coat of old interior latex house paint I had in storage.
Lightweight enough so I can slide it off the work table as needed.
I thought I would have to figure out a mounting system, but
there is enough surface area friction to hold it in place enough
for gaming.
Painted on a base coat of green and gold then applied
ground foam for texture.