Have you looked into a Nissan Leaf motor? Seems like it'd be a great fit and you could ditch the transmission (though custom axles would be $2k). You can usually find a Leaf motor and inverter for $1000. Hell, you could buy a whole Leaf for $5k and use the batteries, too.
I've had good luck with Thunderstruck's stuff. They have a charger I like, though it depends on how fast you want to charge. Reusing OEM components is best, but they can be difficult to control. I think the Leaf charger may have been hacked recently...
Random note: My classic Mini has a 22kWh pack and it'll do 60-80mi. I think actual usable juice is more like 16kWh, too. Seems like you could around that island quite a few times per charge night with less.