full-size model; mock-up
A physical model built at the same scale as the real object, often used for display, testing, or design evaluation.
A full-size model of the new car was placed in the exhibition hall.
We built a full-scale mock-up at the design stage to check it.
Compound of 実物 (actual object) + 大 (size) + 模型 (model). The reading is the standard on'yomi combination.