The best tree seat for a platform, if you want to go that route, is the one made by chippewa wedge loc. If you're over say 200 pounds like I am you will want to brace it up with one inch square steel tubeing. When you get one, tear off the padding and cover the plywood with skateboard grip tape. If you want to leave it in the tree for multiple days, I'd go with the chain harness and aluminum mesh seat. I don't recommend anyone do this, so proceed at your own risk, but this platform is crazy solid, like jump up n down on it without it budging, and silent.