It took me one afternoon, and I'm pretty pleased with the result. While gluing the corners of the arena itself, I seem to have made a few mm error, so the last corner I glued doesn't sit exactly on spot. This was sloppiness on my part, though, not a design problem.

The card drawer was way to flimsy for me. Again, the dimension was off by perhaps 1 mm, and this made pulling it out pretty tricky. I re-printed the drawer at 95% size to make sure it had a bit room on each side, and reinforced it with extra cardboard under the bottom. Now it works fine.

If the drawer-part only had two drawers, I would have added a third "layer" with two additional drawers... I'll see whether I do something like this with the next Arena I build.

As to the removable corner tops: I'm pretty curious as to what will go in there. I imagine a four-poster dice tower would be a good fit, so the dice could fall right in the arena space.

I'm definitely looking forward to similiar items, or to add-ons to this one!

Nice! That was fast

The arena I built suffered the same issues yours did: the last corner wasn't able to sit properly and the card drawer is too large for the space it's supposed to fit in. I'm not sure how much use I'll get from a card drawer anyway, but I like your solution of printing it at 95% of size.

I used mat board for mounting the bottoms on and I *love* the way dice roll in the area. It's an extremely satisfying surface!