Based on the answers provided, the following corrections need to be made to the 3D object:

1. Increase the width of the trapezoid so that it is slightly longer than the width of the second rectangle. This will correct the issue identified in question 4.

2. Ensure that the trapezoid is vertically aligned directly above the second rectangle. This will clarify the ambiguity identified in question 5. If "vertically opposite" implies a different orientation, further clarification is needed.