More sketches. 2nd one probably most practical.

First choice - room with loft and existing 12/4 roof extended
http://i249.photobucket.com/albums/g...zin/HOUSE1.gif

Same, but with open ceiling
http://i249.photobucket.com/albums/g...zin/HOUSE2.gif

Same, but with lower ceiling
http://i249.photobucket.com/albums/g...zin/HOUSE3.gif

Basic room over the garage
http://i249.photobucket.com/albums/g...zin/HOUSE4.gif

One of these days....
http://i249.photobucket.com/albums/g...zin/HOUSE5.gif