The problem with the store bought racks is this. One doesn't help you. When you are building a car, you have at least 2 doors, hood, and deck lid. At best you need 4 of them so 350 dollars becomes 1400. i can't justify that to build a car every 4-5 years. My ceiling is low enough I usually hang them.
I think the biggest regret for most of us who do this for a hobby is not being able to justify first class equipment.
More so now that I am an old guy and going to die soon.