First small up date to follow along.
I took the bicep plate that used for the first set of Yoroi (acquired from Titlewave) and modified them a bit. I cut off the bottom plate and removed the lace sections on the original model, I then added a second row holes on the bottom to be used as the middle and top plates.
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While not a perfect job it did give me the result I wanted when I printed them.
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Ill need to find a lace that matches the color I want still but for the prototype parts it was a good first attempt.