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I resurched the HDPE material and it looks like a good replacment for Corian, I might order a small sample to test for coasters.

Yes Corian is the way to go for outside markers, I have done a ton inside and out side.
you can pick up od sizes from solid surface.com .

One way is to place another 3/4” board the same size as the front, making the marker 1 1/2” thick, but cut 2 slots
what ever width you want for the stakes. Do not come out the top, this will prevent...