Necron Tomb Entrance

This is a picture of a Necron tomb entrance that I found while going through the Necron codex. Me and a buddy are currently playing through a Necron campaign, and i thought a Necron tomb as a piece of terrain would be a good idea.
This is my preliminary mockup of the tomb entrance. The entire structure is made from foam core.
The two accent pieces on front were created using foam insulation bought from the local hardware store.
I still need to add two more taller structure pieces, as well as putting some sort of top on the two tall tower pieces.