I was at an airgun show in Fresno in 2013, and there were two gentlemen, Martin Orro and Hank E. there with a Girandoni replica they had built from scratch. They put on a presentation and demonstrated their replica. Amazing dedication and workmanship went into their project! They also had a Lukens replica that they had built. According to Martin and Hank, the original air tanks were soldered brass or copper and took 3000 strokes to fill to around 850 psi if I remember right. They had servants do this chore, and lost one from time to time when an air tank ruptured! Martin and Hank used a steel tank on their replica for safety's sake.
Thanks for posting the vid!
John