I am currently working on CAD modeling the entire frame and unitbody of the MJ. This will simplify the ability of mocking custom frame mounts, stiffeners, and bumpers. I plan to make this open source. If you have a gmail account send me your email and I'll add you to a special drive of mine where you will be able to access the parts files for Solidworks.
Be patient Its not anywhere near done yet. I hope to have it completely done by the end of the summer, and hopefully a large portion don before the end of may.