I reverse engineered the whole helicopter down to each individual part. I did this for a couple of reasons, one is that I like modeling and like the detailed analyzing of the individual parts. Secondly I'm planning on designing my own frame for the Align T-rex 450 Pro, containing the stock head and tail boom assembly. Having a CAD of all the parts will definitely help the design process, because I can determine the center of gravity, the stress points and other useful stuff.