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

1. The rectangle on the top surface of the cylinder needs to be centered. Currently, it is positioned closer to one edge of the cylinder's top surface. 

2. The width of the rectangle should be adjusted to be about 4/5th the diameter of the circle. This is currently unclear and needs to be confirmed.

3. The height of the rectangle should be adjusted to be about 1/10th the width of the rectangle. This is currently unclear and needs to be confirmed. 

Please make these changes to ensure the 3D object meets all the required specifications.