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I went with a 4" Tri-Clamp fitting. I figured that this would allow me to stick my arm into the keg and scrub it out. This also gives a large enough opening to view the inside. The Tri-Clamp also provides an air tight seal. I plan to weld some sort of fitting onto the Tri-Clamp blank for an air-lock, maybe 2 Tri-Clamp with 1" fitting.

I have seen this design by other Homebrewers and Sabco.

It is completed enough to start using it. I made 3 different beers on it the first time I used it. No test runs. No Back up plan.

Brewing Stand Base