Thanks for the link. Price seems very reasonable. I could pick some of that up for stock whilst in the UK, got plenty of baggage weight to play with! However for now I'm just going to put the steel frame aside, even though I like its strength, and make a simple boxy HDPE chassis. Don't have time for anything more. I expect a Gonzales 2 to happen at some point, in which case I'll have more time to think about the shape.

I didn't get much done tonight, but I got a new wheel on the go. Same concept, but a lot stronger, and with a much thicker and more durable tyre material.