Hello. I cannot afford a really nice smoker so I am trying to build one with a very small budget. My plan is to build a vertical smoker dimensions (haven't nailed this down yet) but am thinking, inside dimensions will be 22 x 18 x 36" tall. I think i'm going with gas...but might change my mind. Inside will be carbonized steel sheet metal, then 1/2" hardibacker, then....then i'd like to use just cheap galvanized sheet metal. In your opinions, the outside should NOT be that hot so is it ok to use the galvanized (zinc) metal for the outside jacket? That is my biggest worry or concern now. Also, what is the cheapest thing to use in place of a replacement grill-something easy to customize. I found some replacement ceramic grills for 100's of dollars!!!!!! I DON'T WANT THAT...even the cheapest grill seems to be at least 50 for my size. I need at least 3 of them. Any ideas? Thank you very much. I will be listening to advise very carefully and posting pics once i start the build.