I finished this up today.
Custom rear hub gives 7/9 speed on 112mm OLD.
I've been wanting to try building this shifter for awhile now.
The rear derailleur is Shimano 600 Tricolour, stripped and polished with some Ultimate Machine Works Ti bits.
I still need to build a few bits to keep it together when folded (with the bars separated from the handlepost).

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What make is the shift/brake lever? Gevenalle or IRD or is it homemade?

Very deep dished wheel, looks like.
The shifter is homemade with a Sunrace (Microshift) 9 speed shifter grafted on to a Tektro RL520 lever.
I Dremeled a hole for the shifter post into the lever blade, shaped the cable stop plate accordingly and fit everything together with JB weld before shaping and airbrushing it.

The rims are 30mm alloy. The rear hub is a modification of a Hubsmith Brompton hub using 14:7 spokes. Having the NDS so far over with triplet spokes results in 120kgf tension left and right.
 

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