Due to the the size of this project, having a well ventilated area and taking breaks is necessary due to the nature of using large amounts of adhesive.
The fabrication methods can be found here: Fabrication Methods, Schedules, and Other Related Content
The model in 123D Make:
This project is going to be full sized, in C3PO's case, 5 foot 7 inches. 319 sheets of 12 inch by 12 inch cardboard will need to be sliced to accomplish this. Maintaining an organizational strategy for gluing these pieces together is going to be needed as 1,321 pieces will be cut out. Below is a picture of some of the pieces on a counter.
Here is C3PO's head: