TBH I never found out - even doing a one-off is beyond me financially, so it's not something I bothered pursuing. I'd imagine you could get a good cost reducti

TBH I never found out - even doing a one-off is beyond me financially, so it's not something I bothered pursuing. I'd imagine you could get a good cost reduction on the parts if you were committed to volume, but no matter what the batteries to give it a worthwhile range would be the lion's share of the cost. My van has a 700+ mile range on diesel (it gives me about 40mpg on a run), and while you wouldn't get that, I think lots would want 300 mile range before they'd consider it as most workmen do a fair mileage.