Answer
The length of the model is 2 feet.
Work Step by Step
To find the length of the model multiply the length of the original by the scale of $\frac{1}{128}$
$256 \times \frac{1}{128} = \frac{256}{128} = \frac{256 \div 128}{128 \div 128} = \frac{2}{1} = 2$
