My takes, order of priority:
- this design screams for some proper hardwood
- start the pocket smoothly, no visible 'dip' at the top
- make the corner "pylons" thicker/bigger, about 3/8"
- make the bottom "platform" a bit higher for strength, 3/4" sounds about right, alternatively, use a bit wider 3/8" thick plywood "boot" screwed into "pylons" instead of relying on fragile cross-grain wood
- make the pockets deeper, so the "central pylon" is about the same dimension as the corner "pylons"
- as you mentioned: start the pocket higher up, in that case consider "partially-interrupting" the pocket about 5" from the ground to create a routed "cross-brace" that would stabilise the structure and improve its resistance to kicks.
In either case, do a prototype leg several times .. before going for an actual application. There is lots of mechanical engineering including testing for kick resistance beyond just the looks such a design asks for to be more than an exhibition piece. Yes, I do like the concept, I can see it even being a design signature - something one would officially patent/register/trademark.
ADD:
This calls for a model and 3D printing some prototypes.