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

1. Adjust the extrusion of the smaller rectangle so that it is almost twice as much as the larger rectangle. Currently, the extrusion of the smaller rectangle is not significant enough.

2. Re-position the smaller rectangle so that it is centered at the same point as the larger rectangle. Currently, it is offset to one side.

3. Ensure that the smaller rectangle has approximately half the length and width of the larger rectangle. The current proportions are unclear and need to be adjusted to meet this requirement.