Hi,
have attached a couple of pics of my two BoBs.

I will eventually get around to making both these boards anew. The IO board will have a minor modification to do with the PWM output circuit.
The Servo board will have the dual OpAmp's replaced with a dedicated line driver IC (AEIC-7272-S16).

Otherwise the board layout will stay the same, namely two boards 60mm x 180mm.

I am giving some consideration to making one single board which would allow the ESS to sit atop the BOB in a similar manner to the MB3.

Craig