Request option to have th eoption for a grid created above dividers if the line up with base grid for stacking on top of larger bins

[Fishie20]

This might be somewhat related to #70, but without a lid. I have some larger (4x5, 3x4) bins that I created that are divided into full unit sized sections, ie 1 base plate, 2 baseplates, etc (see photo). I would like to be able to stack another bin on top, but unless its the same size, it slides around on top and doesn't lock in. It would be nice to have an option to have the thin baseplate style grid on top of the dividers that line up with the baseplates.

This is my crude mock up of what I am thinking, and wish I did before printing this one out