You can't, unless you a Saudi billionaire. These things are completely custom, are hugely expensive (why they have sponsors all over them) and often they will have work lined up for literally years.

You also wouldn't want one. They cannot be driven on the road really as they aren't legal. They will also break a lot. Generally the more tuned a car is the more maintenance it needs.

If you are interested in cars, you are better getting an older vehicle and somewhere to work on it e.g. a garage and working on it as a hobby at the weekends. You will learn a lot more and can actually enjoy it.