This may very well work out well. You may want to test your hypothesis with hosting a page for each of mid-range EV cars. On these pages you can start off with aggregating (i) Company Manuals; (ii) DIY videos already created over the internet; (iii) give open platform to people who own the car to comment - create threads.
Will give you enough to test, get users and create community to understand what sells
Rethink investing in kits + guides at start