Here's something along that line.
She may want to rethink swapping drawers around.
At the pictured dimensions each of those drawers will be both very heavy and quite awkward to manhandle (or is that "personhandle" now?) as the pictured dimensions would appear to be somewhere in the 3ft to 4ft square range and that is a mighty large drawer! And that is without taking into consideration the weight and fragility of any of the drawer's contents.
If the end result is to be anywhere near the same dimensions then it may be worthwhile to break things up into 2 to 4 drawers per level so that swapping them around without need of a team of helpers will be more practical.
Just my thoughts as I was looking at the photo.
OK, if she wants to swap out drawers, scale this to size.