3000 lb is very optimistic for a passenger vehicle, even a car. Most cars are not 3000 lbs. Only the smallest ones are. It's probably possible by using carbon fiber and plastic and composite components.

The real issue is cost. Right now a decent car like a flying vehicle that can carry 2 or 4 people is going to cost around 500k without big markups. The twin engines alone are going to be pushing north of 200k. If you go with batteries you can do it much cheaper but you are limited to 1-3 hours of flight time per day.

If you go much smaller like a 600-700 lb drone bike thing. You could probably get away with 400 HP inline 4 cylinder which is not easy but it's doable, but it's dangerous because you don't have redundancy. With a twin engine drone you can lose an engine and still land and recover from anything. Parachutes only work when you have a bit of time.