Yes, if Peter knows anyone who he could ask stuff about airships, it's definitely Babette!

And resurrecting those engineers?
This makes me wonder if their engineering skills were the only criterium after which Ferdi has chosen them for resurrection, or if he has selected them more carefully.
I mean, given the time period they are from, the possibility is very high that there are some literal (NSDAP membership) card-carrying Nazis amongst them...