Cottonwood
Roadster#433, Model S#S37
I like the cut of your jib. Please propose a time after completion.
Side question: Are the install crews actual Tesla employees or are they regionally contracted?
Installation of a Supercharger is just another construction project with a set of plans that are approved by the local authorities and put out to bid to several contractors. Those contractors hire the various subcontractors to do the work. Because Superchargers are different than the average commercial project, and because they are very similar. There is a set of contractors that have "learned" the process and seem to be favored and/or have better bids.
Tesla has a group of Quality Control people that do visit the Supercharger Sites for final testing and approval with a Model S.