73-87 Engineering Drawings of Frame???

[Shady Chevy]

Something I have never come across, and I thought this would be the best place to ask. Has anyone found drawings of the 73-87 Frame, long or short bed? Some type of scale drawing with dimensions? I was thinking about trying to create my own drawing in AutoCad or Solid works, but thought I would ask before spending the effort. The reason I ask is because for my next project, I would like to create my own custom frame from scratch, but having a detailed drawing of the stock frame would be a great place to start. Any input???