My husband, Mark, built the treehouse 2 years ago, during our 1st summer here. Initially it was intended for our 2 boys (& still is of course!), I've been using a corner of it as my studio until our addition was closer to completion.
The treehouse fills with daylight and has created a really nice atmosphere for painting, I'm able to use it for about 6 of the warmest months out of the year.