Awesome stuff. About 5 years ago I was *this* close to pulling the trigger on a steel building the exact same size. I ended up not doing it out of worry that I wouldn't play my games as often with them outside the house, but seeing what you have now, I might start exploring the option again. I had two storage sheds full too, but unfortunately I sold the vast majority of my arcade collection (kept almost all the pinball machines), and getting them back would be a lot of work.
Excellent collection, man! That's something to be proud of.