DH, LL said that he's 19 in April, so he can go on HIC, cheaper.
He might be 19, and HIC might
consider insuring him (although they might not with an engine transplant) but at what cost?
The most sensible thing at this point would be to find out if it would be insurable and if so, for how much. Otherwise you're going to wind up with a car that is not only fugly, but potentially undriveable as it won't be possible to insure it for sensible money.