This is Paul Dexter's BMW CSE that I've written about on the website previously. It's a seriously well-done conversion with a lot of the bells and whistles of a modern car. It's beautiful, fast, sleek, and unique.
Tesla Large Rear Drive Unit
057 Tesla Motor Controller
Tesla 5.3 kwh
Battery Management System
Paul has an immaculate build blog that has detailed schematics and pictures with diagrams.