The picture shows the clay work done and grid using a crossline laser level. Each vertical gridline is given an ID#. The idea was to have 3xy coordinates for every rib, thereby providing the means to keep ribs in skew and aligned vert & horizontal. At each intersection of the grids a measurement is taken, marked on the clay and entered on spreadsheet. 2 level horizontal lines give a constant dimension at 12" & 18" up from the ground and a 3rd line measured in 12" from the perimeter of my platform that the car was centered on and down.
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Mike
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