I am thinking about building a RF smoker from a 100 g. propane tank. Is there a formula to figure the dimensions of the fire box. I suppose I should inquire about the size of tank to use, the 100 looks good to me, but it's only for my personal use, for family, for friends ( probably not over 50 ), so can you cook a small item ( 1 pork shoulder ) as well as enough for a large gang? I have made little of my welding experience in another thread but I had worked in the frame shop at International Truck, so I have done a lot of cutting, and welding but it was always the same thickness of steel welded together. We used a tig welder. Now if I am going to look for a welder that will do this job, what would I be looking for? I'm retired and money is tight, I suppose it will have to be a stick welder though I have never used one. What ever I get will need to be used. Any advise is welcome and would be appreciated.