Yes I saw that bispoke folding Moulton at BOA last year. Nice job
Here are some other ideas if you want to update your Mark 3 with lighter alloy parts and improve the ride geometry. The real pain is the Raliegh specific BB threads 26TPI, which make it hard to fit a standard sealed uint. I have left my paint job as is and removed the transfers because it is used as a shopping/day bike and I don't want to draw attention to it as a Moulton.
Flickr pages showing various stripdown/upgrades
http://www.flickr.com/photos/45051578@N05/
Regards
Jerry