Traditionally, lack of demand and the fact that GM was fastidious about keeping them off the road means that they would probably threaten a lawsuit. Electric cars in general have only become popular in the last 5-10 years; the lore of the EV1 has grown accordingly.

Copyright law for art and sculpture requires registration of each design; in searching the copyright records it appears that GM doesn't do this. Really the more appropriate forum would be to get a design patent but those last for only 15 years anyway.

Trademarks must be registered (and also apply to specific categories, though a kit car and production car are in the same category). Surprisngly, "EV1" is owned not by GM, but by Kia (the graphic is different). What this means is you can make the (GM) EV1 logo no problem, and also sell a kit car as something like "inspired by the GM EV1" but if you sell it as an "EV1" then Kia might come knocking.

In short, I don't see much getting in the way of making an EV1 kit car as long as you don't advertise it as a literal GM or EV1 car. Though as stated, you can include or sell separately an EV1 badge that buyers can slap on their own property without issue.

Why would you want it? Modern Evs I would assume are superior in both safety and design.

I suggest seeing how Revology was able to proceed.

(They make reproductions of 1967 and 1968 Mustangs)

https://revologycars.com/

I doubt insurance would allow you to register an old Saturn that was converted into an ev1.

You're saying copyright but it's more likely to be a trademark issue.