That back wall is 22 feet tall and about 45 feet long. 

 

The "room" set at left is 8x12 feet.  Those blue walls with the window are 2x4" framing with sheet rock, and on wheels so they can be positioned anywhere within my 2400 sq.ft. space. 

 

The table at right is about 10x10", lit with a Mole-Richardson 2000 watt open faced can and a pair of 500 watt Omni-lights.  I use a Panasonic 3-ccd DVX video camera to shoot footage for our website on that set.