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

1. Ensure that the width of the object is twice its height. This is currently unclear and needs to be confirmed.
2. Modify the rectangular holes in the object to have rounded corners instead of sharp, angular ones.
3. Adjust the width of each hole to be about 5/12th the width of the object. This is currently unclear and needs to be confirmed.
4. Adjust the height of each hole to be about 7/10th the height of the object. This is currently unclear and needs to be confirmed.