THE WORKED EXAMPLE
A 12 m assembly,
a 300 mm display.
A 12 × 8 × 6 m object at 1:50 becomes 240 × 160 × 120 mm. Within a 300 × 200 × 250 mm usable display, that leaves 60, 40 and 130 mm spare along the three axes.
The largest aligned box that fits is at 1:40: 300 × 200 × 150 mm. It touches the length and width limits. For handling room or a cover, use a larger denominator or reduce the available space first.
Understand the method