Ever seen a guy (or gal) build a one in ten replica of a huge MAN truck? Neither did I. The closest I ever came to doing something like that was in highschool, soldering a sportscar from iron wire, with wooden wheels and some broken electronics parts for the engines. It had springs from pens to make the suspension, and I did add a working steering wheel too.
But compared to that, this project is in a totally different class. Structurally built from PVC material, and some metal where required, this thing has it all. Sure, the differentials and universal joints are bought ready-made, as is all control and electrical equipment, but the end result is this beautiful model above, complete with a working hydrolic cylinder to dump the load.