Allen, How about some info on how you cut, fit and built that tank.
It look's real good...
Made a hand held bending tool from 3/4 maple square stock and 2 pieces of 1/4x20 all thread.
Made a tank form out of pine block.
Used K&S .008 tin , it solders real nice. Kester solder paste and solid core plumbers solder.
Wrap paper around form to develop pattern for main body. Make 1st bend, put it on form to mark for next bend, repeat for rest of bends.
To make end caps, stand main body on end, put 1/8 square stock against each tank side and trace around it, that gives you the solder flange.
I also made a special small bender just for bending the flanges on end caps.
Only hard part was the interlocking finger joint (about 3/16") on main body seam. I have made tanks with simple overlapped seam, but the interlocking fingers is much stronger. It takes a some practice to get it right, have extra tin stock on hand if you decide to try it.