Power wiring complete!
Yay, finally got it all together! Made up a little common earth rail from a junction block, and assembled all of the wiring. The ceiling and side lamps, 12v and cigarette socket are all cabled up, as is the voltmeter and most importantly, the inverter. The inside of the cabinet is, admittedly, a rats' nest, but the bit that you actually see is pretty bling. Photos to come.