Sorry, not plastic but, CSI Vegas had the 'miniature killer'. The gimmick spanned two seasons and several episodes. The killer or someone close would leave a scale model/diorama of the crime scene at crime scene. Of course the miniature had clues that the actual scene did not. On more that one occasion there were visits to a model builders work bench. Hand crafted pot metal molds were the subject of a specific investigation thread.
More connotation that model builders are derelict.