The latest BYO has an add for the Ruby Street Brewing Mega Ruby. It is capable of 20 gallon batches, featuring 30 gallon kettles. I covet this and have slowly been adapting my home made brew stand into something that looks like their product. Of course, I have very limited space.
If I were you and had such seemingly limitless possibilities, I would scourge the NET for examples of systems, brew sheds, etc, etc and realize your dream.
One such link is http://www.brewzilla.nl/?brewhalla
Lots of examples of brewing rigs. Good luck.