Well, congrats. It looks like you are one step closer to realizing you're dream. One caveat though is to maybe go to an HT store and ask if you can pull a chair up a bit closer and try sitting 10' from a 100" image and make sure its not too big or that you cant see screendoor, etc.
I am currently doing exactly what you are asking, except right now I only have an 83" screen. My front couch is only about 10' from the screen and the back couch is right behind it. But, my back couch is on a riser, which I think helps a ton. I will be moving my HT into the basement when it gets...