I made the 3 z-studding ties. These were made out of 74 mm x 24 mm blocks 3/4 inch thick. I started by drilling two 5.4 mm holes, one in each end. I drew two lines from the opposite corners to find the exact center where they crossed. These are about 30 mm deep.
Next, I cleared two rectangular holes through top and bottom. The location of the first is (x, y) is (10, 8 ) – (32, 16). The location of the second is (42, 8 ) -(64, 16).
I put a small screw through one end to hold a nut in place, then a longer screw and nut to make the adjustable end.
