The real trick is figuring out how to compute "diversity". How many of those tools will be used at the same time.
Perhaps the KVA rating should be based on the number of workers, not the nameplates of all of the "operator required" equipment.
It is really hard for a "one man band" to keep 40a of equipment running. My 230a stick welder (the biggest load I own) says it is 48a but I have been running it on a 30a dryer plug for 40 years and never tripped a breaker.

Greg Fretwell