Nice job X! Original.
I built one similar to the A frame plywood design you posted a pic of. Not proud of it after putting it into use. I need to junk it and do better. It is not stable enough and the casters didn't roll smoothly if there were debris on the floor. I wanted a slim one due to floorspace reasons, but I quickly overloaded it just with 3/4in oak and maple veneer plywood and a bunch of cut offs. I put larger pneumatic tires on it instead of casters, and gained some ground clearance. With that ground clearance I made a rack underneath for metal lengths thinking it might help stabilize it (lower the CG). The HF tires wouldn't hold the air over time and they developed permanent set.
:smiley_aafz: