The build instructions on the Makerbot Wiki site ( are pretty good for the main body of the build.  It starts to go sideways when you get to the electronics.  There are several versions of the Cupcake body and the electronics packages. Maintaining all the possible paths and components would be tough, but the Makerbot wiki cleanly comes off the rails. I could say more, but in an effort to forgive and forget, I will leave it at that.