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

1. Change the shape of the object from a regular geometric shape to an irregular rhombus. This will address the issue identified in the first question.

2. Add a right-angle triangle on top of the square base. The triangle should be connected to the top of the square to address the issue identified in the third question.

3. Ensure that the right-angle edges of the triangle are the same size as the length of the square. This will address the issue identified in the fourth question.