Tiger I Early Production w/Full interior. Plastic Model building is an area of model building in which models mainly made from plastic (now most commonly polystyrene) are built. This usually concerns driveless standing models where there is more interest in the high level of detail than in strength or functionality. These can also be a toy. Construction sets are mainly made from preformed parts. More rarely construction sets made from deep-drawn shapes (Vacu building kits) and pure resin construction sets can be found.