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

1. Make sure the bottom edge of the pentagon is clearly the shortest edge. This might involve adjusting the lengths of the other edges or the bottom edge itself to make the difference more noticeable.

2. Adjust the height of the extrusion so that it is clearly almost two times the height of the pentagon. This might involve increasing the height of the extrusion or decreasing the height of the pentagon to achieve the correct proportion.