When we moved to Ohio, my workspace was only 6 1/2 feet wide, but 15 feet long. It was at the back of the house, over the walkout basement, so it still felt as though I was up in the treetops, so the name stuck.
Not so with this house - but it's a lovely sized room with a nice view of the back yard. Here are a couple of before shots:
And here's the "after" view, taken just a few moments ago.
Left side, as you look outside:
Left side, toward the rear of the room:
Right side, as you look outside:
Right side, at the rear of the room:
Back wall, with open closet door:
And I'm still not done unpacking!