Wow that is great! I was looking at those at Lowes thinking in terms of mounting it on top of a base I was thinking how to make tall enough and strong enough, and thinking of engraving holes for fingers on the bottom. For some reason I had not gotten to thinking of the top.
I wonder if Mathematica could work out the design in 3d that would make a strong 28" base?
I cobbled together a bunch of ideas that survived structurally but artistically not so much : https://community.glowforge.com/t/a-proof-of-concept-big-and-round/24000/9?u=rbtdanforth