Shelving units for card box storage
Just wondering what everyone out there uses for storing card boxes to keep them easily accessible. I have mine all just stacked in a corner which is fine except for those on the bottom of the stack.
I'm planning on moving everything I have into 5000-count boxes and building a shelving unit to hold them all. However, I figured I'd check and see first if there are any commercially available units that work well for this.
If not, then I need some help from any members who know this stuff better than I do (which is to say anyone who knows anything about it since I'm clueless).
I have approximately 120,000 cards, so that would be 24 of those 5000-count boxes. Each box measures 19"D x 16.5"W x 4"H, and weighs approximately 25 lbs. I plan to put two boxes per shelf. Thus, I am planning on 12 shelves that are 20" deep and 34" wide, with 4.5" height so I have a little space to work with. Each shelf would have to support approximately 50 lbs. The entire unit would be about 6 feet high, give or take a few inches depending on the requisite thickness of each shelf.
So, oh great gurus of carpentry, or at least people who know more than I do about it, is 7/16" oriented strand board good enough for this? If not, what about 1/2" fiberboard? Or, am I going to have to suck it up, wait a while as I save up some money, and just go for some sort of plywood?
Your thoughts and advice are greatly appreciated.