The honeycomb will not make it stronger or stiffer, it will make it more impacts resistant.
Sorry, but the honeycomb does make the panel stiffer...by increasing the space between the carbon panels...the farther the panels are apart the more it would make the panels have to stretch if the panel is to bend...
...also at 217 grams per sq foot for a carbon/nomex 1/8" panel....verses 475 grams for a 1/8" thick carbon plate it sure sounds like the carbon/nomex panel is lighter to me