The solution proposed for the Heliowatcher, at a first glance, is not easily scalable to bigger dimensions. Although the weight of the panels itself is not so much, the car jack dimensions would be larger and the arms would begin to flex.
Maybe a central axis is much practical to rotate the panels.
I haven’t already read all the documentation, but I’ve a question: in general, most trackers have 2 DOF (degrees of freedom): a rotation around a vertical axis, and the inclination. What is the most relevant in term of increased efficiency of the panels? One could imagine to control only one parameter and accept a residual loss in potential efficiency?