It's very motivational to see someone tackle this kind of project with entry level welding experience. I've never welded but I'd like to learn. I could use some basic welding skills with some of the components I've been coming up with for my brick fire pit project. If you don't mind me asking, how much did your welding setup cost? Maybe I'll splurge someday and buy myself some welding equipment. Besides, someday, I'd like to put together something very similar to what you're doing (maybe a bit smaller and without the vertical unit though). So, it would definitely come in handy in the future.
Also, what is that you're using to cut through the tank? I could use some metal cutting capabilities too.