I would add a big porch-- Architectural Designs Exclusive House Plan - 4 beds, baths PLUS a full basement with another bed and bath and family room and bar and. You'll just have to look at the photo album. Over 100 pictures fully-furnished.
Step by step of an awesome dad building his kids a tree-house. Those kids better be more than grateful! Most kids don't get an awesome tree house (if one at all) like they do. I just wish they took pics of the interior space too