Where do you live? I have taken classes in AutoCAD (last semester actually) as well as my work is in AutoCAD and 3D modeling in SolidWorks. Additionally I could take the measurements of my bumper, which is a custom plate bumper, for you if you wanted. I just did it on the fly with some cardboard and didn't design it in CAD, but if I took the measurements it would probably be easier to just draw it up for you anyhow. Depending on where you live we could meet up so you could look at the bumper and I could give you a quick lesson in AutoCAD, if you wanted. Good luck with the bumper.