MACCA (I almost typed in "Paul" by accident!), that was a great post -- made me laugh. Especially the mention of you being the impatient person who couldn't wait!
I love the idea of having a projector and screen in our living room, but considering the crazy layout of the place, I simply can't control all the lighting. There's a TON of natural light coming in through the windows. With heavy curtains, I can eliminate that, but lights from other rooms (dining room, kitchen, den, hallway and entrance) spill out all too easily into the living room, which has no doors -- very open concept. And I'm far too accommodating: I just can't tell my roommate to not use any of those rooms when I'm watching TV/movies. He's got a life too, blah blah blah.
I wish I could post a layout of my space; you'd see how difficult it would be. But I really do think a 100" screen would be too dominating in my tiny living/dining room -- about 300 square feet, I think. Being dominated is sometimes a good thing, I imagine, but that's a whole other thread.
Cool that the setup works for you, MACCA, more power to you. I wish it could be me!
cheers,
supervij