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This is roughly how the arms are used, but with the dish inclined at 18.9 degrees to the vertical rather than pointing at the zenith. Dish is 230 x 250 mm, made from 3/4 inch aluminium plate. The heaxagonal pockets are milled out to save weight but retain stiffness. The dish surface is accurate to about 20 micrometres, with 4 micrometre ridges from the spiral machining using an 8mm ball-ended carbide mill at 11500 rpm and 2800 mm/min on my SYIL X5 CNC mill #hamradio