Build suggestions and hints
I've completed my Marty, and he's connected, calibrated and charging.
For the build I have a few suggestions for updated guidance.
Working over a smooth soft surface is a good idea to catch dropping parts. A clean tea towel is a good option, used in the football pitch so the edges would also help.
Put the nuts in the head before adding anything else!
The nuts that go into slots are easier to handle if the piece is held horizontal so they are held in place by gravity. A small blob of blutack or piece of masking tape can help hold parts in place and can then be easily removed.
Connecting the head to the legs. I loosely started the inside two nuts/bolts before attaching each leg, which made the inner connections much easier. The outer ones are quite straightforward.
It's a good idea to have some spares (thanks) and I would suggest that you state this clearly as otherwise some customers may wonder what they've missed when building.