Based on the answers provided, the following corrections need to be made to the 3D object:

1. The orientation of the object needs to be clarified such that it is clear which side is the bottom side of the object. This will help in accurately determining the location of the cutout.

2. The size of the cutout needs to be increased. Currently, it is less than 1/4th the length of the original shape. It needs to be adjusted so that it is about 1/4th the length of the original rectangular object.