Did I just make a pun about writing utensils and poop, based on a popular idiom? Yes. Yes I did. You're welcome.
I'm going to go out on a limb and say no one is going to answer this.
While it may be lighter, cardboard is a tad weaker than fiberglass.
Only saps think this wood work.
I'm so used to looking at kludges that the only thing that bugs me about this picture is the mismatched knob and lock. ~Not-So-Handy Andy