Upon further reflection, and several friendly warnings from those more experienced in such things than me, i am removing all the original text from this post and warning others what a stupid idea this is, and it should not be undertaken if you value anyone's life. After reading the thread linked further down this thread regarding the danger of pressure vessel welding, i completely agree that it was way above my ability, and added to that fact, it was a rusty discarded tank to begin with. I wanted a project and I had the tank laying around, but I did not realize what a dangerous idea it was.
To the several Brothers who objected to this project, especially tanglediver and Bearston, thank you for your concern and advice.
I will concur with those advising not try this dangerous stupid project.