drawings
get in touch with SP ask them for a drawing either in CAD or PROE, these can easily be translated into C++ or CNC trans package. Alternate to this pass on your stripped down body to a company that machines or produces alot of piece parts. Asking them nicely, do you have a CMM plotter? and could you measure something for you?
You will then have an exact 3D representation of your body from which any machinist worth his salt, should be able to mill in your design. Offer to help also, this might help whoever understand what you want to achieve.
Simon Mason