I finally had time to finish up the assembly guide for the RBA kit. Phew!
One big observation: the first batch of 10 boards have the Tx and Rx pins not swapped, so if you plug in the FTDI cable the board can’t be programmed. For this reason, the first 10 customers will receive for free an adapter that swaps the pins. All you need to do is plug the adapter into your FDTI board or cable, then plug the female part of the adapter into the RBA board. This bug will be corrected in the next batch.
Here is a picture of the assembled board:
And here is my LMR Start Here Robot with the RBA on it: