Either Styrene or sheet metal, or both, probably brass, and copper. I intend to use this hull as a model, but first I am going to use it to make molds, so I can produce Remote Control versions and parts from it. I am also considering copying the parts in resin cast to make The worlds largest 1/72 scale ship kit to sell. I have already started working on plans for a Graf Spee, an HMS Exeter, Ajax, and Achilles in the same scale. but I want to stay focused on this project for the time being. The good thing about some of these ships is that allot of the parts will be the same, IE gun turrets, range finders, catapults, Float planes. so some of the things will be easy to get, or reproduce.