Well I've decided to make a homemade pipe... And by pipe I mean pipe, not bong. I've looked at a few other threads. I kind of have an idea of how to make it now. I'm planning on a metal one, but I might make a wooden one. If I decide to make a metal one, which metals should I use and which metals should I avoid? And if I make a wooden one, what kind of would should I make it with? Is there anything else I should know not to use for making a safe pipe?