Article from '13 . https://www.greencarreports.com/new...rs-1963-volkswagen-beetle-electric-car-driven . 
Sure, 'bout $6,000 for the pack used in a Leaf.If the batteries lose range...replace them!
The same can be said about people dropping LS1 into Miata, but anyways, I don't see the point consider there are better candidate to turn into EV like, a Corolla or Civic.Totally ruined a piece of automotive history. The old saying "just because you can doesn't mean you should" applies here.