I bought some large scraps of corian at an auction today. I think one could
be used for a great router table top, but I have never heard of anyone doing
it; so maybe there is a good reason not to.

Speaking of corian, can it be used as a base for sand paper for sharpening;
or is it just not flat enough?

I got 3 pieces 1/2" thick about 36" by 36" and a bunch of sink cutouts for
$5.