First, Toms set up gets my vote for the niftiest set up.
The OP could always add to the HF unit to make it handle the extra size. It's a simple design that he could just pick up the scraps, cut them and bolt his own together, for short term wood would be fine.
Since everyone is throwing pictures around hehehe
The reason I like the slats and clamps besides that it is cheap and easy is speed. When I saw the HF stand my first thought was that I'd have to remove and put back 4 bolt/ nut sets just to adjust it. When I need to adjust for tilt, I tilt the panel forward a bit. push or pull the slats to where I need them and set the panel back down to its new position. It can go from near vertical (early morning) to near flat ( noon) in seconds. When the winds hit, I can tilt the top, kick the slats flush with the frame and lay it flat in seconds.
I could clean it up with metal legs and quick tightening bolts/ knobs like used on a folding lawn mower handles. A little nicer looking with the same results.
