The secret to card truck quilt block

This has to be the hardest quilt block I've ever tried to reason out. 4 hours yesterday and I just couldn't get it 

I had to fiddle with the different sizes and I finally realized there were different size triangles in some of the block. Here each if the 9 sections that make up one block laid out. I hope our son in law appreciates his gamecocks quilt when its done