The only tuff things about adapting any car to EV,
1) Manual transmissions are a much easier conversion than automatics. (often only 1 or two gears required)
Elio has that option. Just need the adaptors, which are not hard to provide. Single gear, stepped belt solutions are easy too.
2) Power steering - there are already common electric-motor solutions
3) AC - again, there are already common electric-motor solutions
4) Where to put the batteries, and accommodate the weight, not hard in a short-range demo for show only.
4a) A lot harder for longer range and reliable in crashes or for other handling dynamics in the production vehicle.
The current exhaust path could be placed on both sides and would provide extra spaces for more batteries.
I think the most important question is, does a $15000 USD vehicle expose enough profit margin to excite a 'real' investment?
... given that Tesla and others could step in and compete in just a few years?
Hub motors are much more problematic, in a trike, affecting many dynamic issues. Very attractive, but not that easy. Custom engineering for each application is required in my opinion. But I would like to see one someday. Maybe combined with those airless tires that might not need that much suspension.