I would guess that Tate took my basic drawing that I sent him and put it on a computer system to get some made. I have my original drawing somewhere which shows the main co-ordinates , hole sizes and spacing but when I had the final run of plates produced I did an over-sketch of the final "curvey" design, which Tate has showed, then discussed it with the laser cutters, they made them & the rest is history. I can only supply an "old school" drawing so not sure if Tate can post a CAD version.