Over here in Australia we enquired about getting the EV insured.
They will insure it, but they will only insure it to the market value of the pre-converted vehicle.
Seeing as my donor vehicle cost $300 and the conversion will be around $9000 i can see a bit of a problem replacing it with the cash the insurer is willing to give.
The market value may be a bit more than the $300 but not a lot more.
That was just one insurer, we haven't shopped around to see if that is the same for all of them