I am fairly sure that building a car from scratch is like building a kit car, or a heavily modified car. I think you either have to apply for a new VIN, or you use some component (suspension, windshield, etc.) and then transfer the VIN. Or, you take it to Florida or some other state with "friendly" regs and register it, then transfer the registration.
To get 150mpg in an ICE will be a major challenge, btw. The best that Edison2 got was ~120MPGe IIRC and they had a 250cc single cylinder engine (max ~34% efficiency with lots of EGR) in an 800 pound car with a Cd of ~0.16. To do even fractionally better would be Herculean.
On the other hand, EV's are pushing close to 200MPGe and there is room for improvement. We'll see how the Edison2 VLC does with an electric drive -- it might even surpass 300MPGe (<100wH/mile).
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