In order to make things easy, I marked off the bottom area.
The left black is at the very bottom.
The green # 1 represents 1/4 inch of space between the bottom of the frame, and the bottom of the bottom drawer.
The first red line on the left, between the # 1 and #2, represents the bottom drawer.
Green #2 is again 1/4 inch of space between the 3rd and 4th drawers, since I will have them 4 high.
As you can see, the green numbers represent spaces, while the red lines represent drawers.
What we need is a total of 5 spaces for the 4 drawers.
