Stackable Plano Box Holders

This project is for all those who have stacks of Plano boxes kicking around
whether you actually use them for fishing lures or fill them with project parts,
components and the like. This design is for creating multiple, same width,
stacking support frames so that bottom boxes can be retrieved with ease and then
put back. I needed this as I want this parts in my workshop but when on the road
will fill my toolbox with the appropriate parts I need.

This is version 1 of the design, in version 2 I would like to create a front cross
brace that will stabilize the front more and also allow for differing width boxes
to be stacked.

note the back and side parts are printed upside down...