"We built this tree house together in six weeks for under $4000. Reclaimed oak wood cutoffs make up the floor, and all windows and doors were salvaged. Inside is complete with a sleeping loft and composting toilet." (From a post on Living Off the Grid)
Roost Treehouse. It is designed to copy the natural curves found in nature. The purpose was to build a treehouse that could blend in with the surrounding forest. The treehouse is built using sustainable materials. The design by Antony Gibbon looks like it came straight from Lothlorien (The Eleves’ forest home) in Lord of the Rings.