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

1. Adjust the position of the rod so that it is pointing upwards from one of the corners of the rectangular surface, instead of being centrally aligned with the base.

2. Ensure that the length of the rectangle is approximately 1.5 times its width. This may require adjusting the dimensions of the rectangle.

3. Adjust the height of the rod so that it is 3 times the length of the rectangle. This may require changing the height of the rod.