Based on the answers provided, here are the corrections needed for the 3D object:

1. The object needs to be reshaped into a complete rectangle. Currently, it consists of separate pieces with various angles and shapes. 

2. Incorporate two square-shaped cutouts at two corners of the rectangle. The current design does not clearly show these features.

3. The edges of the square cutouts should be rounded. This detail is currently unclear in the design.

4. Ensure that the square cutouts are located at the corners corresponding to the longer edge of the rectangle. This detail is currently unclear in the design.

5. The extrusion of the rectangle should be small. This detail is currently unclear in the design.