Looking at treehouse plans online - sometimes you see joists on top of the support beams, sometimes it's all one layer using joist hangers. Is it best if joists are on top or does it matter?
Here is my plan... Beams are 2 laminated 2"x10"'s on each side - each floating on treehouse attachment bolts. 2"x8" joists on top using hurricane ties. 4 4"x6" knee braces below - 2 on the beams, 2 on the joists (via a horizontal 2"x8").
Alternatively, do I make the beams/joists all one layer? Maybe everything is 2"x10" like this: