This is fantastic!
How much tweaking did you find you needed to get that 60deg angle? What if the bottom of the 2x4 (or2x3) was cut at 60deg and hinged onto a short 2x4. Would that help or be a nuisance?
Or, what if the hinged pieces were sized so that they would join in the center. Would that add to the strength of it or just be useless extra lumber?
Just trying to think of ways to make something like this where it's fairly simple to redo often. A friend and I built two out of 4x4's and 2x4's (had a pile of 4x4's so they were free). It was so cumbersome and heavy, we called them "Arks". I want a light, easy to travel with design, and this looks like it.
What about drilling up the center of the board (on the bottom) about 6", sized for rebar, and use a 12" rebar so 6" are in the ground to inhibit slipping.
Think this would work adequately for very large fellas? I'm only weighing in at 165, but there are plenty of us who might put something like this to the test.
Sorry... lots of questions... very cool design!