the Roadster is a Lotus Elise with an EV drivetrain installed by Tesla, there is good parts supply for the original Elise.
https://www.elise-shop.com/original-lotus-parts-c-17.html
The EV conversion made the car a lot heavier and was a pretty complex conversion https://www.forbes.com/sites/jeanbaptiste/2018/09/18/elon-mu...