Based on the answers provided, the model needs to make the following corrections to the 3D object:

1. Ensure that the cut out is exactly 1/4th the length of the original shape. This needs to be clearly visible in the design.
2. Make sure that the cut out is 3/4th the height of the original shape. This should also be clearly visible in the design. 

These corrections will help to clarify the proportions of the cut out in relation to the original shape.