Since you are going to think on this a while, I'll offer another path.
Think of a separate car.
Yours is running and driving, I take it.
For the price of modifying this one, you can often buy a complete, sorted car.
Think Neon, Caterham, Elise, or whatever turns up when you have the cash saved and ready.
It can be road legal (easier), or a track only car, which requires a trailer and tow vehicle.