If this were to be a stand alone business and I needed to make a living from it, it would be difficult to hit my target price. But, I am retired, 56 and bored. I love kit cars. Have since I was a teenager. I know what the cost is to build frames. I know what the cost is to produce fiberglass bodies. I have designed and built one of SEMA's car of the year. It was 1 of 7 cars honored at the Hot Rod Hall of Fame induction ceremony in 2003. Some people wanted that car so I sold a kit for it. I sold a good number of them then gave the business to a relative so that I could pursue something new. I sold the kits as a hobby. I am doing this for fun. I don't care if I make any money at all.
The key to keeping the cost low for this car is to eliminate the need for aftermarket parts, the need to modify or custom fabricate parts. By using everything from 1 Miata the cost can be kept low. By using the cradles and keeping everything in the stock location it eliminates a lot of frame building work, keeps the geometry as designed, and allows the use of any part designed for the Miata. I am using the electrical system, gauges, fuel system, exhaust system, steering, suspension, wheels tires, brakes, E brake, radiator, fan, ect. The kit will be the frame, body, windscreen(Dot approved glass as option), aluminum skins for the floors, foot boxes, and bulkheads. There will be some other small parts as well. It will be up to the builder to provide seats, seat belts, and trim pieces. They can customize it they way they want.
Here are a couple of recently finished cars I have built for myself.
The black cars have the same aluminum chassis. The bodies can be switched in 45 minutes. Drivetrain and suspension is C5 Vette. I made the bodies.
For my Cobra I purchased the body from Shell Valley. I built the frame. It uses C5 suspension modified for the narrower Cobra. I converted the Diff so that it accepts a drive shaft. It bolts in to the stressed trans tunnel. The tunnel becomes a large torque arm. The LS6 is bolted to a T56 6speed.