Double doors (about a 4 x 7 foot opening back left looking at screen). Ceiling actually tilts up form the front 10 feet to maybe 14 feet to a 90 degree drop down to 10 feet (where the projector will be mounted).
Thanks! First room I've ever had that was dedicated to HT, just got a Sony VPLHW45ES projector and it looks amazing. Aside from the mounting I need me some sound :).