[Johan]

Remember the Amphicar? Not a good boat, not a good car ? You will need to swap a lot of stuff to run track days and then go back to street use. Tires of course, and then there goes your bodywork. The side widows will need to be removed as most clubs require that they be down. Shocks, perhaps springs, ride height, etc.
I am not down on using the car on the track. I am suggesting that it be built as a track car first and foremost and that the compromises be dealt with on the street rather than build it as a street car and then wonder why it will not keep up with a Porsche.