Yes.
I used to work proffesionally in my home country, building Boats and windmill wings. Continued as I moved stateside, but as a hobby. Back in the mid 90's there was not a lot you could learn about composites, unless you took an apprenticeship. That changed with the rise of the internet in the late 90's. I felt strongly that my mission regarding composites was to teach people how to create and use them, but without the intimidation of vacuum bags, and autoclaves. So I began hosting in two forums, Thumpertalk, and ADVRider, building things or should I say parts with everyday tools and parts from your local hardware store. Well.... almost. I would be an idiom arguing that cardboard is on par with Nomex honeycomb, or any other aerospace honeycomb. I build parts on par for their design, so that they are affordable for the everyday man/woman to be able to afford. Nomex is about 7 times more expensive than the carbon fiber sheet you lay it down on top of.
So it is all about creating the void between two layers for stiffness. Corrugated material is about $3 pr yard, rather than $150 pr yard, and it will work, with a few caveats. If you g too thin on the layers of CF you can squish the cardboard, so that is one. Arresting the plates along the edges is another, but other than that, it will serve its purpose well. Just wait and see.
Sorry.. I'm impressed and still laughing. 