I found a mistake, the Microchip MCP72832 Lipo charger I put in is different in a way I didn't expect. The status pin is open drain. On the MCP72831 I was using before it is tristate. The charging led would not light. I flipped the led around, then I flipped the resistor 90 degrees, then I solder that to 5V. It lit up and charging works fine. Here is a photo of the rework.

I also noticed the female connector bends back plugging in if I am not careful. I coudl glue it or some redesign. I put a 1k pot on power to simulate a load, and the comparator doesn't trip to UART. Although at 23.5 ohms (3V/23.5=127mA) the UART Tx and Rx leds light up. I had wanted it to switch to UART mode when sourcing current. Have to figure this out.

For the laser cut wheels, here i what they look like. I sandwich 3 of the cutouts together. They smell like burnt wood all the time.

Here are the tires (o-rings). I got black (called Buna) and Silicone (red) to which is stickier. Silicone is softer and stickier, but red might look funny. I actually learning somethings about Durometer, 50D is softer than 70D (the hardness measure).