Neat write up, looking forwards to potentially seeing this at RoboDojo one day.

If there's one thing I've learned from repeatedly binge-watching Scrapheap challenge, it's to NEVER EVER use chain drives for anything when you're bodging, so with that in mind here's the chain drive from the motor to the leadscrew for the linac:
Did you use a chain drive as a defined weak spot in the mechanism in case the stresses are too much and/or for weight saving purposes?

Meanwhile, in a curious form of progress, Becky and Simon stripped down Wedgeley Mk I to the bare bones, to replace most of the panels, motor restraints, etc.. I am looking forward to a future where we make robots with MORE SPACE IN THEM.
Hahahahaa, I know the pain of building inside very tight spaces with quite thick wires. Right faff to get all the wiring into Jibril (and Azriel on the evidence of what I have put together so far) with all the cables everywhere.