Quick update. Here's the car as it currently sits:
I've put a couple more interior fittings in - just need to fit up stuff like the switchgear, which should remove the short on the rear lights!
Note lovely new leather-rimmed wheel - bought with the right collar on it from a junk shop in Holland!
Having the seat in enabled me to test out a couple of things yesterday - I can confirm that the clutch and gear linkage work, as I've now driven it (about 50cm) backwards and forwards.
Next session forecast to happen on Sunday - I need to get the Quattro-motored singlecab out of the way so I can drive the Golf out!