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In 1926 you could still buy a new electric car, such as Detroit Electric; they were not much different from the gasoline cars of the time, and you could copy the general design except using modern components (especially the battery and controller).

A few years back the motor would have been obvious - a beefy DC Forklift motor with direct drive to the rear axle
That is still an option but they stopped putting DC motors in forklifts about 10 years ago - so they will eventually run out

The other option is a bit more difficult - but the entire drive unit from a production EV in place of the back axle

That will give you a much more "Sophisticated" machine
Swapping in an entire salvaged drive unit, and the independent suspension that is needed to go with it, is usually the technically preferred (but often not at all easy) way to go. In this case, it would be so unlike the original car that it seems like a strange choice.

A variation that might be interesting is the complete drive unit, but with a de Dion axle suspension that would look almost like the original axle at the ends, including the springs if you want. It looks like the original has a plain live beam axle on leaf springs.

A motor (probably with a reduction gear set, depending on motor operating speed range and torque) placed where the original transmission was is still possible, even with a modern motor rather than a brushed DC motor (whether salvaged or new); it would be like the electric cars of the time.
 

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According to that article about Detroit Electric cars (thanks for the link to kool info) they were supposed to be reviving the brand ~10 years ago
...but, I've never heard of it (or them), did they ever get it going?
I don't think so. Just about every old brand has been the target of a revival attempt, usually having nothing to do with the original vehicle or its manufacturer, and most fail.
 
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