Here's my homemade forge. I decided to make it after looking at other's for purchase and realizing that I could make one to suit my needs for far less money. All of the parts are pretty basic. The body is a 10" diameter by 38" long piece of pipe. I have 6 ports spaced evenly across the length. Some have asked me "isn't that too many?" I wanted to have even heat all the way down. Another important aspect of my forge is that everything can be broken down. I can swap out parts or experiment for whatever reason. It also makes it easier to move some place without damage. The ports are standard black pipe with a bell reducer threaded on. The jet bar was made with nuts welded onto 3/4 "x 3/4" tube. The jets are simply mig tips threaded into the nuts. Using mig tips, I can swap them out for different sizes easily. The most important part is the insulation lining. I used a two-part system. First I laid in three layers of 1/4" ceramic fiber paper. Fiber paper has a great insulation quality but is very poor when it comes to holding up with steel being dragged on it. It is only a paper of sorts. So for durability I added an additional 1-1/4" layer of ceramic fibred cement. This product is not a good when it comes to insulation but that's why the paper is between the cement and steel body.