Habitate for Humanity runs stores in some areas, (NoVA) being one, where they have all kinds of doors, building materials (esp. tile), etc. You have to be flexible and able to live with limited choices.
I know enough to know it looks effed up, but I can't figure out the details from the picture. But then I'd never try to hook up my own gas anything either.
That's a heck of a lot of bird cages on top of those shelves! In addition to the PVC air line police, you run the risk of the no-woodstoves-in-the-garage constabulary!