Sounds like and looks like you are making great progress. Take your time, it prevents mistakes. When I said the screw types only make 7.5 Psi ,I meant that they usually limit them. They are capable of much more, but no one wants a blown up engine with rods hanging out the side. I've owned a couple of turbo charged cars that were limited to 7 psi but could put out somewhere around 20 psi. A lot of the GM Eaton supercharged cars are limited in what they output. You need bigger intercoolers, etc. plus they want to keep down warranty repairs by limiting the output. Just comments, sounds like you have your plan mapped out and are doing well with it.

Dave
dtinker