Interesting thread and good to see the variations on the HT theme. The readers digest version of my DIY multi-year saga began several years ago. I started with a dedicated space and a firm commitment to a multipurpose room with light walls and windows for natural light. Audio has always been my focus with video as a secondary consideration. I had fairly good light control but far from perfect for optimal FP video.
This was the first cut: Powered FP Screen and 58" Plasma, Revel Speakers and JL Fathoms subs:

The seating:

This was a nice setup and versatile with the dual screens but I found myself watching 95% movies and was getting a crick in my neck splayed out on the sectional sofa watching movies. A friend had HT chairs in his HT and the comfort delta was considerable. Also, the Revels were fantastic speakers for music and normal volume HT viewing but when watching concert videos they simply would not play as loud as I wanted without distortion. Another friend had purchased some Pro Audio derived HT speakers and I went for a listen. THAT was the sound I had been looking for so out went the sectional sofa, the plasma, the audiophile speakers and in came two rows of HT chairs, a bigger AT screen and lot's of very big speakers:
My version of a screen wall:

Behind the screen (not pretty

):

The seating:

While the room is far from perfect, it is exactly what I need it to be. A comfortable place to watch a movie with friends and family. It sounds great and the projected image is all I need it to be. The modifications that were made to the room could be undone over a weekend returning the space to it's original state to be used for another purpose by a new owner. My house is large by modern standards (3700sf) and to dedicate 400sf to HT would be for many, a misuse of space. For me, it was a no brainer. and I am very happy I did the project.
