I made it at TechShop, www.techshop.ws, it's a template that I cut on the laser cutter to quickly lay out cut lines and bend lines on a piece of sheet metal. It's actually half a template as the pattern is larger than the 18x24" cutting bed.
The first step was to draw it in AutoCAD.
Step 1: I Cut the Template in Half to Fit the Cutting Bed
I just drew a line down the middle and trimmed to it in AutoCAD.