A member of folder community in SK just completed his brompton MOD. It's the second best-looking brompton I've seen so far (excluding UFB :] )
He started with secondhand taiwan brompton (Which is sold at around $300), disassembled & re-painted the whole frame, got custom 130mm-spaced rear frame for cassette hubs (ordered from japanese custom shop) and custom FD clamp to build a 18-speed brompton.
Wheelsets are built using 355mm birdy rims and 74mm/130mm AM classic hubs. (Also available from japanese shop) 18" stelvio tires are fitted.
The bike look damn cool with all black outfit.
Custom FD adaptor and double crankset
cassette rear hub and 9-speed cassette
wire chain retainer is used (ala birdy)
paul levers / thumbie/DA shifters
Yes, it does fold.