Mostly piddling around today. Not much to do on the 'bot until the batteries arrive.
And then there is this:
In the early design drafts of this 'bot, I was toying with the idea of nearly-360 UHMW bumpers surrounding the 'bot, thinking the combination of curved surface (harder to find a flat spot to push) and springiness (absorb spinner energy) would be an advantage. I had plenty of 1/8" UHMW left over so I tried a 180-degree version this morning and what you see is the result. Bonus: convenient carry-handle!
I'm not committed to keeping it yet (I still have the straight side-rails) but I get to ponder it for a while...