That looks amazing! Must be nice to have all the toys needed to put that together. In reference to your question about the BBQ regulator, get a high pressure regulator (10psi). There are lots of places that carry them, you might even have one laying around that wonderful shop of yours. If you do, it SHOULD be RED in color (indicates high pressure). One word of caution. If you do use a high pressure regulator, open it slowly, otherwise you will probably trip the excess flow safety in the propane tank, and you will not get any flow.. If this happens, just shut off the tank for about 30 seconds, and then open the tank valve very slowly. You might want to consider a larger propane tank as well. A 20lb cylinder won't last too long flowing at ~ 10psi through a 1 1/2 " pipe.