Not been on in ages, so masses of catching up to do, but Really Well done.
Not sure if it's relevant Tom, when I ran LPG cars I replumbed them so the water went to the heater first, rather than the vapouriser first, made the cabin much more toasty. Told by 'Experts' it was stupid, the car wouldn't warm up and the gas would cut out. It didn't, well it did, once, when i went straight from cold onto a dual carriageway at -12C.
Also, I'm planning on the double Din thing too.
Top Tip.
When bending wire, hold it with the pliers and bend with your thumb, gives a much tighter bend. If you hold the wire and bend with the pliers, you get a sloppy bend that can slip out of the locating bracket.
I'll take some pics and show the difference. I should also be able to lend you a pair of proper wire bending pliers if I can find my spare set.