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

1. The extrusion length of the square needs to be clarified. Ensure that it is almost twice the length of the square's side. This will help to make the proportions of the object more accurate and clear.

2. The object needs to be hollowed out, keeping only the top of the extruded square. Currently, the object is solid, but it should have a hollow section to match the description.

3. The height of the extruded circle on top of the cube needs to be adjusted. Ensure that it is about 1/7th the height of the square's extrusion. This will help to make the proportions of the object more accurate and clear.