Very interesting. Mark's build is probably along the same lines or the project ardvark build. The reason I think people restore the rusty frames are to have the all important VIN number which allows registration and insurance. Kit cars without a VIN of sorts can be difficult to get certified for insurance or road use. If it is a track only toy then the requirements are much less, granted I think some places still want VINs for insurance purposes even for race cars.
Would be interesting, 350z's are pretty affordable, and if you could find a way to use the sub frames and such and the stock suspension pickup points the list of benefits would be pretty neat. The problem then would be you are basically building a lighter 350z with a body kit. Mark has a very modified power plant and suspension setup, and the project aardvark has similarly extensive modification, but for drift usage. I'm not sure how the car would be running 350z geometry in a shorter wheel base with a different balance and different weight.
Will be interested in what you come up with!