Volvo's no where near as heavy as Commondore wagon, with similar space, so it makes some semblance of sense...until you make it a 2 seater, but each to their own.
Seen one made out of a converted Kombi, which made for a pretty practical thing.
Leaf isn't available here, and the Holden Volt is available early next year at $55,000 Oz ($57k US). Can get one off converted Hyundai Getz for about $48k.
As to doing it yourself, Fatty O'Barrel, our newly elected Lord and Master has decided that individually modified vehicles need to undergo crash testing...a bloke who restoed a late 60s mustang is looking like having to build one the same to crash test before registration.