Prototype Models Almost a shop within a shop, some of Serco's most experienced and skilled craftsmen perform near miracles in quick turn-around of vitally needed, precision made prototypes. The customer demands of accelerated product development lend increased urgency in the making of pre-production models. CAD data being used for a prototype is often adapted to the design of soft tooled pre-production runs, while being analyzed for high production tooling - all progressing within the same time frame of our shop.