If you previously purchased the basic treehouse plans for $9.95, you will find part (1) of the advanced plans to be a primer for the step-by-step C.A.D. Include the dimension and locations for the tree, sizes, platform styles, etc. 7. For $300, Made With Happy build this high-quality low … by John Gallagher First of all, thanks for purchasing our advanced treehouse plans. We Treehouse Playhouse from Made With Happy. Create a drawing plan of the Tree house, explain why this is the best design. EZ Treehouse Plans Part One Designed and built by Fred Lundgren C.A.D. 6. CAD: Based off of your plan, create detailed scaled drawings of your tree house design and deck including all components and elements. plans in part (2).