They look like they would have held a ton, and technically they do, but they weren't going to hold enough or solve my larger terrain pieces problem. With the need to most likely drop another $400-500 bucks on these, a tool chest seemed a better solution.
Here is the toolchest I ended up getting. The good thing is it easily holds all my stuff and there is still plenty of room left for expansion for Dwarven Forges KS3 coming down the road.
The only problem now is it's a bit bigger that I realized and it's kinda overwhelming the area I have it sitting. I'm going to have to move some stuff around to get it situated better.