Pondering an "if I won the lottery" silly project.

I would want to buy a Nissan Cube, and turn it into a rolling NeXT Cube. As in the computer. A nerdy visual pun for people who are aware of a somewhat obscure 90s computer.

I have the specifications for the exact Sherwin Williams paint, so I can get that just right.

But I'd want it to have a better engine, maybe also get rid of the CVT.

How hard would it be to put in an SBC? Or, more to the point, how much would I have to pay a competent person to do it?