100 cm is 3.37 feet. 2 grid squares is 6.74 feet (about 6 feet 9 inches tall).
Box 1 in props is 100 cm. Take box 1, resize it to 200 L x 100  W x 10 H 
and make a prop out of it in iClone. Add markers on it and send prop to CC.
Then use as a height chart.