Thing about having someone cut a part is that if your dimensions are a millimeter off then the material is ruined and you have to start over. I recently purchased this: http://www.tormach.com/Product_CNC_Scanner.html
It helps but it isn't as easy as I thought. You still have to write the file. I was hoping for a "copy and paste" piece of software. What it does do that helps a ton is that it can record and save an exact copy of whatever it scans. Once that's done you can modify the file to do what you want. What that means is I can scan a body, measure the dimensions, export the file to MACH3, "draw" on the copy, input the desired depth of the cut and run the file. Say I want to mill my screen name in a 99 Cocker body. I'll scan the body, write my name on the file, enter the desired depth(how deep I want my SN milled in the body) and run the file.