There’s alot more to it here in the states and doing above idea would get you into some trouble real quick. It must be issued an SCV VIN by VSTS, and doing so requires alot of work. Believe me if it was that easy I would have had my kits cars out roaming the roads four years ago.
Doing so technically still requires VSTS intervention, and a specialty construction vehicle VIN for it to be legal. It’s more of a loophole effect really, and how the T-Rex is registerable but it’s not legal in all states.
The VSTS techs are not dodo’s and they’d catch this. No doubt. They’re the final line between you getting the sweet yellow VIN sticker and 272.1(which allows you to get VS103 for reg eligibility). If you attempted to pull this they can flag the entire project and it would result in HUGE headaches for you EVER getting an SCV legalized. Plus it would raise some serious eyebrows if you were pulled over in a four wheel vehicle reg’ed as a bike or trike. Cops don’t take that too kindly.
I’ve been dealing with this kit car paperwork for a LONG time now. I can build and legalize a vehicle like above.