[brian_]

Welcome to DIY Electric Car.

I like this idea of building variations on the same model of car - you have the efficiency of knowledge shared between them, and you can use each of the components you have in the most appropriate build.

I don't know if anyone has described a Sprite conversion in this forum, but there has been at least one Midget, so there will be some examples of possible conversion choices.

 

[brian_]

I would think there is a large market for an electric conversion kit that puts the electric motor in a casing that can be used to replace the BMC A series engines. These were long lived and used in a myriad of different cars.

There's no need for a special case - all you need is an motor-to-transmission adapter plate (which is specific to the bellhousing bolt pattern for the engine) and a motor mount that works with the vehicle.