So I got a little more work done, just a few more hours and I should be good to start the sheeting. I forgot to mention on my first couple posts that the "L" will be fit up as one piece but split into two pieces for ease of moving into the basement. The size and weight would have made it difficult and I didn't want to weld this whole project together inside the house. You can see in the pics below where the frame has been doubled up, that's where it will split.
Split the top and bottom, welded them out.
Got most of the uprights in, just need to put one centred on each end wall.
View from the Back
Doubled up section where the tank will be split in two.