I'd love something like that but it's never going to happen. We're planning a move in the not too distant future, but it will be to a smaller house, so there simply won't be space. I've got a small polycarbon one now, and when I assembled it I had to leave out some panels because there wasn't a safe area where I could use the whole kit. So the best I can hope for is that in our new home I'll have room to assemble it at full size.
I have a small house (about 950sq ft) but an ok size yard for this area. Actually the bigger backyard and larger garage sold me on the property. The house is just somewhere to hold our stuff, sleep and shower. The outside space was more important.
But for a greenhouse like that I'd first need a bigger house. The reality is this year I plan to upgrade to a larger portable greenhouse because it works the best for where I am now