I have my heart set on a Lista toolbox, they make boxes up to 56" wide with only full-width drawers, lots of customization, you can take the drawers out and put them back with different depths in different spots again, or buy different-depth drawers later, and they offer different tops and bottoms. The prices looked comparably pretty darn nice compared to tool truck stuff, too, but I don't know about what gauge steel they use. I think they mainly market to race teams where you see giant garages with hundreds of feet of 26"-wide kitchen-style counter-high drawers, under an actual counter top, and they can break it all down to travel. AFAIK they're a PA company that manufactures locally, but I could be wrong.
Dunno if you already knew about Lista, but if blueprint drawers ended up being cheaper and could hold the weight of hand tools, I'd be sold, whether they come single and have to be stacked or what. I was looking for at least 40" wide and around 18" deep though, and maybe 200 lbs capacity just to be on the safe side.