At what level are you going to offer the kit. Some people may be looking to save money and like to have the project that they can set up to there standards. I am sure you can save a lot by shopping for the engine package on your own as well as interior and hardware. Anyone that would take this type of project on I am sure knows what would go into it as hours and money. I know two people off the top of my head that woud be interested and they have talked about this very subject.
I have a question tough? If someone takes a kit can they race it in F1?