Although it has a lot of detail, the playhouse plans were designed with economy in mind. The 8'x8' plan works well with standard lumber dimensions, and handmade shutters are used instead of pricey windows. The base is built similar to a deck, so if any water gets through the shutters it will drain out.
Oh, did I mention there is an additional adult sized door on one end. Most adults can fit through the front door, but if you want to use it for something else such as a garden shed when the kids are grown this larger door will come in handy. Speaking of doors, the front door is a dutch door. What kid wouldn't love that!