Puck 1925 Diorama Set (Naval Base). Plastic modelling is an area of ​​model making in which models are predominantly made of plastic (now mostly polystyrene). These are usually unpowered stand models, where the interest is more on a high level of detail than on robustness or function, and they can therefore only be played with a limited amount. Kits are predominately made from prefabricated parts. It’s rare to find construction sets made from thermo-formed moulds (vacuum building kits) and pure resin building kits.