After welding together the three rings and attaching the base, I began the much-hated grinding procedure. All visible weldments had to be ground down to flush, and then the entire surface was sanded with a variable-orbit sander to blend it all together. Once I had that done, it was time to stand the thing up and invite everyone I knew over for beer and pizza. I also sent out some press releases and got articles in the local alt weeklies and the Denver Post. I think it was just due to the free beer, though.
And here it is finished and installed at the Little Rock National Airport: