British auto companies have a long history of supremely reliable engineering, especially in electrical systems. I’m certain that a Jaguar EV will be the pinnacle of reliability and longevity. It might even rival the quality of the old British Leyland cars.
Assuming you formed a legitimate company that sold fully assembled vehicles, I’d guess a minimum of $1 Billion USD in starting capital is necessary.
For starters, you will need a proper place to manufacture the cars. That’s going to cost at least 3 or 4 million before you buy equipment, which is probably around $1 million. Most of the money will go to wages for the employees. You’ll need enough to cover the first 3 or 4 years of expenses while you develop the first car. Then you’ll also need enough leftover for materials and production costs of the first car.
The startup cost is one of the big hurdles and most companies have a line of investors who help cover it.
This is determined by a lot of variables, but the main one being how many cars you can sell. GMA and Pagani are smart and try to secure buyers before the car even enters production. But they can do that because they are lead by legendary car designers who are trusted and have fans.
The easiest way to start a car company is to work up to it. Start by manufacturing and engineering specific parts and then eventually grow the network and talent pool until building a whole car from scratch is feasible. You also wouldn’t jump to stand-alone models, but do conversion kits and kit cars first. Those don’t require as many resources and are less of a financial risk.