@kyle Wow, of course... when there is a market, things can be invented. I didn't know about this kind of conversion existed, tnx for link. I don't have a car, never have had, but my dad have a "almost new" in my view Volvo S60 from 2007. Maybe it can get a 2nd life as EV. By the way, your link reminds I read about the Mars II Electric manufactured in the 1960s. (article is locked, but you can see the first photo). https://www.dn.se/motor/i-backspegeln-elbilen-fran-1960-talet-far-nytt-liv-i-sverige/
@hehemrin While a lot of it is custom and expensive work, the demand is high enough you are starting to see aftermarket kits for popular vehicles. For instance this company has a series of kits for vintage porsche and VW models: https://www.evwest.com/catalog/index.php?cPath=40