Well. I was thinking of making a battle arena for antweights, by making a square out of polycarb, either one sheet with lots of curves, or seperate pieces for walls. Then a single sheet of curved at the edges polycarb to make a basic debris shielding roof to neatly fit over the walls, and allow even spinning antweights (which i youtubed, and they exist! Surprised you can get spinners with antweight sizes)

antweights wouldn't need any more than a few mm of polycarb to contain, even the low force spinners i suspect (I'd probably need to build or borrow one to double check and do safety tests here), so perhaps a heatgun approach would work. however that style of arena wouldn't upscale to even beetlweights and still be able to guarantee debris containment i suspect.

I'm trying to think of ways of containing things, for an upcoming tournament I'm going to try hosting. Antweights is the first challenge, then beetleweights and featherweights is where the awkwardness will begin I suspect!