It's done!!!
Or at least kind of.
I got the seat back from the upholstery shop, really pleased how it turned out.
So after 4 years of working on the little FT, this is how she looks now:
I got the seat back last Saturday, just in time for the Distinguished Gentlemans ride.
The ride towards the start (roughly 2 miles) went OK, but I already noticed some strange electrical behaviour (cockpit blinking on and of)
After about 500 yards into the official ride the bike stalled and didn't want to start for a good 15 minutes.
When I got it started up I went home immediately, bike seems to have some issues with either the earth leads or maybe the ignition switch.
Back to the (electrical) drawing board.