Our major cutting table 5' x 8', is HDPE. We ordered the large sheet from a manufacturer and basically, built a table around it. A side of leather fits well and also serves as a worktable when needed. Punches work just fine and are not damaged, knives aren't dulled. When scratched, gouged, we simple sand it out. I've been told that we can also take it to a woodworking shop to run through a large planer as needed - we haven't needed to yet...
We store rolled up hides underneath in white PVC irrigation-type pipes that run the width of the table. This keeps the leather out of the light, off the floor and easily accessed.
AND, you can find HDPE at any kitchen store (and Wal Mart/Bed, Bath, & Beyond as well) as cutting boards. Super cheap in just the right size for the boards you're talking about.
Love your mask and corset!
Shirley