Barry7767 sounds good ....
Dreamer .. I see what your saying but let me clarify, the 'sun room' for want of a better word is not a conservatory it is a solid brick built extension with a proper tiled roof and plastered ceiling with 4 solid plastered walls. A wooden door for access from the dining room in on one wall, a small window on the far wall which will be behind my screen, a solid blank wall at one side and a solid wall with a french door in the middle on the other.
So I think after a few semi permanent mods it could work (black velvet devore wall / ceiling covering and some way of temp block of door) I also plan to build a enclosure for the FLCR speakers below the screen again covered in black devore cloth.
I also will have the avantage of having all the AV gear in the bedroom above and the projector mounted on the ceiling of the dining room behind (projecting through a suitable 'hole') the only things in the room will be the screen, speakers, 2 recliners and a couple of bean bags.
I am not expecting a IMAX but just a nice little place to get immersed in a movie with a few friends.
Things may be progressing as I have a guy coming for a third viewing of my house on Friday...
Tal