Concrete Block on Pallet - Loads for Flatbed Trailers

I had an idea proposed to me the other day, so I decided to make a new design.  I have been thinking about suitable loads for my flatbed trailers, and pallets of concrete blocks is a perfect fit.  I probably over-engineered the design, but I don't want the stack of blocks to look like one giant block once printed.  So I decided to design individual tiers that could be printed and then stacked separately, including the pallet.

You can see here that I designed a pallet, top and bottom tier, and then 4 middle tiers that can be turned a quarter turn when stacked to "tie" them into the other tiers.  I voided the middles to reduce print material.  I also created a render of what the load will look like after assembly.