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Plate thickness should be ~8mm (5/16”) , it can be thicker, but should not be thinner (to accommodate counterbore)
Material is whatever is available the easiest, aluminum or steel does not matter
The distance between each pair of holes is the critical dimension, from longest to shortest length of hole pairs: 17.4”, 16.7” and 11.1” corresponds to the tie rod, push rod and UCA respectively.
Surface machine the plate if there’s time to make the jig better toleranced.
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