At the Hawaii site, the ground is full of ash and, therefore, it is not very rigid. So we have had to design a big concrete base which is not cheap. We have observed a 4 arc sec in pointing just from an indoor concrete pier. Some antennas claim a 1 arc sec pointing accuracy. But the problem is the time interval for such pointing.
Most telescopes have to change the fitting coefficients every one or two hours.
The plate is a lot cheap. And for bending due to the high wind, the truss section is the main factor in reducing deformation. We believe that by shaping the trusses of the tetrapod, we can have an antenna temperature as low as the BIMA antenna. Q. I heard that your CFRP tubes have problems. It should not produce problem for the dish.