Tere ought to be a section on the forum for homemade pipes, bongs , and vapes, as well as the folks who make them.
lol, this is the one i used to use. but its dead now materials used: 1.5 litre coca-cola bottle aluminiumfoil tape paper towel roll (obvviosley without the paper towels on it =PP) downstem (baught at a shop) two skateboard wheels (without bearings) cardboard i used the wheels as weights because it was way too unstable without them, and then the cardboard to create a flat surface. it was pretty good (concidering it was my first homemade )