You'd have to work out the numbers Jarrad, but I'd have thought a mechanical tidy-up and a basic repaint to make it look nice, would take a fraction of the time a restoration would. The art would be in picking the machine to work on. There's no way you'd make money out of taking on a basket case and selling that for $500 in good condition.
If you could find a way to get them to Perth, there seem to be plenty of easily fixable SB45s in the eastern states for around $150.
