This project is similar to my previous one, but a bit more complex.
It is also a CNC routed tombstone that I made at the Tech Shop in San Jose.
See previous instructable here: basic CNC tombstone
In this design I mount the main tomb in-between two pillars or columns. Part of the reason is decorative. The other reason is that it seems Home Depot will no longer be carrying the basic ingredient, the Foamular (pink) insulating foam. This foam is much easier to work with that the white foam. In my area they no longer have any of the 2" thick foam but have plenty of the 1" thick foam still in stock. This design uses the 1" thick foam and provides for a place to hide the mounting PVC without having to fully laminate two sheets into a 2" thick tombstone.