Eventually, with some help from some friends, I tracked down an industrial sized lathe that I could work on. A local engineering company, namely DMM came up trumps, for which I am forever grateful!

For now I am just working on one single wheel mechanism so that it can be tested. Simultaneously, I am still trying to get a high power stepper motor control board working. New PCBs arrived yesterday - there was an unfixable fatal error with the last version so daytime is to be spent populating the PCB and night time working on the lathe. Who needs sleep?

In between everything else, I'm still working on the CAD design and have managed to get all four wheel assemblies onto a chassis, which is quite satisfying.