Rado,
Check out this link:
http://www.hexcel.com/NR/rdonlyres/5...Properties.pdf
Its got some interesting reading on the properties of honeycomb core construction. It has some interesting data regarding this type of layup. Aerospace as well as the military use this type of core construction.
As you may know Hexel is one of the largest producers of carbon fabric. Cool stuff!
Dr.V