Box of Blocks Puzzle

https://www.youtube.com/watch?v=d8FJXXsxSU4

This is a packing puzzle known as the Slothouber-Graatsma puzzle.

you can read more about it here....
https://en.wikipedia.org/wiki/Slothouber%E2%80%93Graatsma_puzzle

This puzzle can be deceptively difficult the first few times you attempt it.

I originally created the blocks with a face to face thickness of 30mm because that is a standard thickness of stone counter tops. I had hoped to have some scrap counter top material cut to make th