so nothing too major really? just a thought about the brakes... they'll probably be seized, so instead of reconning or finding new 4 pots and rear calipers, why not go to red lodge or beck row scrappy and get some scorpio/4wd cossie brakes? they'll be cheaper off a scorpio while you're at it, you could get the 20mm rear ARB from one too

diff change is easy - under an hour

ecu is easy - under half an hour

engine could be out in a couple of hours too