Okay, so I tried the little cardboard version, mine is drying right now. I'll make another post when I test it out. I think cutting cardboard with a utility knife is a much bigger pain than just getting some 1/4" plywood and using a table saw or something. I've found that my cardboard varies a bit from the width of the cardboard used in the plans, so the measurements have needed some adjustment. Gluing is also tedious. It would be easier to use wood and a brad or finish nailer.
Anyway, the plans are good if you don't want to spend any money. They seem like they will be fairly sturdy, surprisingly. I'm just too impatient and my husband is too much of a perfectionist, so we'll be making our own versions in wood and custom fit them to our shelves. The cardboard version makes it easy to see just how you want it though and is definitely a help for creating our own plans.
I'll try to remember to write down measurements for the wood version when we make it in case anyone wants to copy it.
Can you tell my kid is sick and I'm bored out of my gourd???
"We can seek for the bad in others. Or we can... extend to others the understanding, fairness, and forgiveness we so desperately desire for ourselves. It is our choice; for whatever we seek, that we will certainly find."