Hello; These machines, devices, and materials are astounding. Wow amazing machines, clean and original content. This is so satisfying and such a lovely video . Also we get know about different ideas and machines. As far as that blue Barrel on the end of that extension on that little tractor, why don't you just scoop up that load of pea gravel and then put the Portland and water in it would be way faster. At 2:48 this bricks can´t be in one column but in sheet binding.