Whats up guys I've decided to jump off into the deep end and start my first RF build. Work gets slow in the winter so I figure it will be a fun winter project. Plus I'll get to work on it with my dad which is always fun. Anyways, here is what I got so far Picked up a 170 propane tank for $125 from a local propane yard. Here is the inaugural tank fill up with dish soap Also got this scrap 120 gallon (I believe?) thrown in as well. I would like to use this for the fire box. According to Feldons pit calc the tank will be within 50 cubic inches of the recommended size once I make a clean cut all the way around the tank just behind the cut out part shown in the picture. How lucky is that! I would like to cut a square in this end of the firebox and weld in a frame for the door using some angle iron. I just had to show off my drawing skills in this picture I cut a temporary hole where the firebox opening will eventually be using a cutting wheel while the tank was full of water. This is so I can drain the tank and use a plasma cutter to cut the real hole for the fire box and doors. Current Questions: -What is the best method to mark out the doors on the tank? I would like to have two doors. Should I purchase a wrap around pipe tape? -Anyone have ideas on how I can mark the opening for the firebox being that my tank and firebox are both round? I was thinking I would line them up together and then trace the curvature of the firebox on the pit with a marker attached to a stick Thanks for any help!