I am with gilltech on this.
if you can eat your dinner off the floor then you are not using it in the right manner. Everything in its pile and a pile for everything.
You have to be able to put your hands on anything at a moments notice. It is also not just for cars . It has to have all kinds of machinery and it doesn't matter if you don't know how to use it.
It can not have a square inch of vacant wall space . Something must be stuck to it or hanging from it. If you run out of space then add a other section to your man cave . You know you will .
That will inspire you to take on any number of projects and not finish one. Ok may be one ,possibly two.
Mine not only houses a car and spares, but also model hobbies in the form of a railway and ships. I will post pics if you want to see them.