Hi Buddy
Hope I can throw in some inputs. My HT setup has started 2 days back.
Some of the things in the design are:
1) AC - Split AC
2) Flooring - Anything would do. You would have to experiment with rugs to see if you are not dampening the sound too less or too much
3) Walls- For aesthetics I think you should go in for plain walls with heavy curtains. I am planning to have 2 sets of curtains. 1 is light colored and will be in the foreground (to let the light thru) and the back one will be a black one on a slide rail (to cut the light)
4) I am planning to have the satellites in-walled and hang some paintings (obviously acoustically transparent) over it (tho I am still struggling at it).
5) I am getting a low height entertainment center built which will house my DVDs, AVR, settop, worldspace and DVD player. The electronics section will have low noise fans attached at the back of the cabinet (since it is closed from the front).
6) Concealed wiring.
Regards
Raman