If I were to build one of those, it would probably be the last one. Large enough to keep things from bumping and a good work area with a 2 post lift. If I didn't want to wrench on my own rides, then the Living room parking would be my route.
A little over the tops, the last one would probably be the choice, as stated before. Room to move stuff, a hoist and on top of that, you can have other paying work to pay for the mansion and land taxes that come with it.
The glass one has a great view, very cool design but I'd like to hide my cars a bit, not that he had anything over the top nice. Lexus and Porsche..cool design, definetly not for me..and a little over the top.