There are boutique supercars and then there are garage supercars. Factory Five is already a leader in kit car replicas of Shelby Cobras and Daytonas, as well as '33 Ford Coupe hot rods. But there is also a kit to build your own supercar, taking the sort of thing that companies like Caterham do to a much bigger extreme. The car is called the GTM and it is powered here by a 7-liter GM-sourced naturally aspirated V8 making an undisclosed amount of power.
There is some flexibility in your choice of engines, but the car is based off of a Corvette donor, so Vette-compatible engines obviously work best.