Took the plunge a couple of weeks ago and ordered parts from all over, which eventually all arrived. Spent yesterday putting things together, and went for an 80km shake-down spin today. Nothing rattled, and nothing fell off. Happy enough with how it turned out, I haven't decided what to do regarding rack or luggage, not settled on saddle or pedals, but I'll leave it as is for a while. It's pretty tall, due to the high bottom bracket on these bikes, approx 2" higher than normal. The brace between the chainstays wasn't drilled for a fender, so I ended up with a bit of a bodge, using a Daruma eyebolt and cable tie, if anyone has a better suggestion, let me know.
Nitto Threadless Adapter, Nitto Bars, Ergotec Stem, Gran Compe Friction Bar end Shifters, Cane Creek V Brake Levers, Berthoud Fenders, Compass Naches Pass Tyres.
Cheers, Niall.

M800 Before

M800 After