The screwfix pipe is just cheap galvanised steel conduit. It’s £10 for 3m. It doesn’t rust, is smooth enough, and you can cut it easily with a hacksaw.
Sorry, I forgot it wasn’t obvious, but Ryan is the chap who runs V1. He’s active on the forum, so I used his name when I meant “The V1 web site shop”.
For a basic machine, the wiring is really simple; although the wiring kit (from V1) makes it plug and play.