if you cut the front platform step even with the sides and nail about a 6' 2x4 up on each side . so, 3 ft is below the platform (for support) and 3" foot is above. then take 2- 2x4 back towards the tree with the top at 17" and then 2- 2x4 back towards the tree at the top 36". put a couple of boards on top of the lower 17" rails for a seat and the ones at 36" (when you sit down) will be great arm rest. thats how I build them, and i sleep in the woods all the time, espeacially when the sun comes up to warm you as little... But, I use 16' 4x4's, I like getting a little higher.