My display humi is like that. I can adjust the shelves to lie flat for storage or tilt them for display. It'd hold a ton of boxes if I just closed them and stacked them.
For display (boxes open like at the store) it only holds maybe 30 boxes.
I really have no desire to look at a stack of boxes through glass. I'd rather throw them all in garbage bags and toss them in a closet.
My display is almost worthless at holding humidity, too. It takes about 10 pounds of beads, three fans, and two hydras to keep it relatively stable.
Here's a pic of what I mean...
I had everything in the entire humi on the top shelf when I was cleaning spilled beads yesterday.
I think mine is smaller than the one you showed, it's 80"x46"x16".
Now that I looked, it's about the same size.
