Oh, how could I forget this in my last post?
I made a structural load analysis of Scrooge McDuck's money bin, made a somewhat detailed floor plan based on Don Rosa's original drawings (they needed some redrawing, since the structural columns didn't line up between floors), and am working on a detailed AutoCad/Revit set of actual engineering blueprints, just for the fun of it.
For the record, the total weight of the coins in the main vault is close to a quarter of a million tons. Depending on the currency you put in it, you'd require as little as 470 million dollars to fill it to the 100-feet mark.