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

1. Modify the object to resemble a shovel excavator. This would involve adding mechanical components such as a bucket, arm, and tracks that are typically associated with a shovel excavator.

2. Make the base of the object clearly shaped like an irregular rhombus. Ensure that the base has four sides with all sides of equal length and opposite sides parallel.

3. Ensure that the rectangular prism is attached to the center of one of the extruded edges on the rhombus. This might require adjusting the placement of the rectangular prism.