Please
TheStolenInvestigator , don't accuse somebody without having some solid proof. Especially on such a popular build as the Saturn V: there are a lot of them, and it's possible that 2 accurate recreations have similarities. Even if he got inspired by another one for some parts of it it's fine.
A build is rather considered a theft when the person downloaded the blueprint and posted it as is, without any work from him and without giving credits.
We don't like thieves, but we can't allow that people get accused unfairly either.