An electric Seven, hmm
Power-wise, it would be awesome at local autocross due to the lack of noise and its low end torque. Total weight, though, would likely be a fair bit more than the equivalent gas model, depending upon the desired range.
As for how it would do at a trackday, that's harder to say, since its terrible aero drag would be an issue at speed, versus how many corners are involved. For the same reason, freeway range would suffer due to the drag. Electric cars excel in stop-and-go traffic, but their advantage is lost at higher speed.
Cost will likely be yet another premium on top of an already expensive kit (else we wouldn't have this forum!).
I've looked into doing an electric "whatever", and if you want any sort of performance (meaning, not using Prias or low-end Nissan electrics), figure it'll run around $10K, not including batteries. That last bit is a killer. OTOH, if you can find a wrecked Tesla for cheap, that helps.
Lastly, many all-electric cars have VERY invasive computers running them, and if they detect someone's changed things, they can brick themselves. There was a story about someone buying a wrecked Tesla, fixed it all up, and it wouldn't start. Tesla had remote-bricked it, not wanting a non-factory repaired car ending up back on the road. I can see both sides of that, and haven't heard whether this has been resolved. It might take someone developing an aftermarket ECU specifically for Tesla drivetrains.
Bottom line, the whole project isn't impossible, but will be much more expensive than gas, assuming you want performance.
_________________ Midlana book: Build this mid-engine Locost!, http://midlana.com/stuff/book/Kimini book: Designing mid-engine cars using FWD drivetrains Both available from https://www.lulu.com/
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