Manufacturing a new 10HP compressor block

1. Why do these third world shitholes always assemble their machines on the ground and in the dirt, instead of on a clean bench?

2. Essentially his assembly techniques are correct - but I'd rather see him properly use a press to assemble the ball bearings onto the shafts and into the housing. Hammering is just a bad idea - as the impacts and shocks can dimple the races and flatten the balls, leading to premature bearing failure.

3. Overall - this is a good video on how to assemble compressors and by extension, engines.