Amazon.com description: Product Description: This fort was specifically designed in a certain manner. The picture on the front cover is the actual fort that was designed for this plan. Some modifications were made to simplify this plan for the novice. These instructions are a guide to build a 4x4:4x6 two tier fort that is roughly ten feet tall. It has a ladder leading into a four by eight foot housing area. The housing area is four feet from the ground and the roof is four to six feet from the deck. I would like to point out that the instructional drawings (illustrations) are not to scale. They are renditions to help visually explain certain details, not to be taken as scale models. They are approximate shapes and patterns. I would recommend reading the entire instructions before proceeding, thoroughly. There are options, choices and special notes that may be of interest to you. Cost: The price for the materials to build this project would be dependent upon what material that you purchase. Some lumber is more expensive than others. However, the original structure was created with standard pine so the general cost would be around $500, which would include hardware.