Here are a couple of pictures of one of his latest: Image hosted by Image hosted by Note: it is only 4 feet from the ground to the top of the stairs. From Edward himself (in the comments)

Not to cause confusion but it is 4 ft to the last open step near the corner post of the playhouse. The playhouse itself is elevated about 6 feet. The whole structure is 8 feet, 4 inches wide and 9 feet, 2 inches long.

Email Edward for more information.