FlexPVC.com had everything I needed for the Pro-Star plumbing hook up if that helps. Three gate valves from Metric to Standrd.Congratulations on your build. Everything about it is fantastic!
I am currently building a ProStar 150 and use your thread as a guide lol. Hopefully I can build something as great as yours. I am far though... I am currently stuck on the plumbing. I thought it was EU metric.. to my surprise it's Japanese...
Anyways, again, fantastic job and I look forward to more posts!