Okay, I've added as many extra inches to the circumference as I dare. Actually measuring the distance from the left side of one leg to the left side of the next leg, and strictly doing the addition in my head without writing anything down, I came up with 810" of circumference. By the math I was employing above, it should have come to 819". Doesn't matter. I dare not disconnect another crossbar from a leg. I did that this morning in order to add another 1" section. I was unable to exert enough strength to pull the cross bar back to the leg from where it was extending a full 3.5 inches past the side of the leg to which it needed to be connected. So, a little creative engineering and I made a "spreader bar" (see photo) by which I was able to spread the outer ring sufficiently as to re-do that last connection. Now I got a problem with bottom of the legs going inward such that when I pull one out in order to make room for a flat bottomed liner, the next leg over goes in. I'm thinking that if I ever get it filled, the outward pressure will allow me to disconnect a crossbar/leg and just let the liner do it's job. This has become a freaking NIGHTMARE!
P.S. I tried with a 1/4" pole and it bent so much under the pressure that I was afraid it'd break and impale me. So I went up the 1/2" piece.