Thanks for the messages folks. Not so many Westfields on the roads near me (Haslemere, Surrey), but I did pass a red one with Toybox stripes on my second run, with lots of enthusiastic waving from my daughter and I. So far a source of many grins, particularly with passing traffic heading towards Goodwood FOS this weekend.
I'm still going through all of the build details, layout sketches, hand-drawn loom design etc, which is all present if not chaotically "organised" in box files. Love it. I'm a complete nerd for this stuff, but I have a feeling I'm in good company!
The original build got a little write-up in PH, back in the day, and there's been quite a few improvements since... and only 11k miles
https://www.pistonheads.com/news/clubmans-pistonheads/super-westie/5524