I made a plywood version this morning and learned a bit. The inside corners need to be cut out where the blue lines are shown to allow for clearance around the ropes. The platform size and shape are much better for sitting, but it still works for leaning. I didn't have my phone fir pics.
The downside is the step still comes a little loose when full weight is applied, then goes back tight when you unweight or remove the platform. Someone else on here came up with welded tabs on the outside of the Perch to make it better. I watched closely and the prongs do move when weight is on the platform, so he is onto something. If someone can figure out how to hold them in place using the pattern I came up with, we may have a winner. Otherwise, I am done playing and going to stick to my 3 Squirrel Steps on an ocb.