Or it's just a metaphor for rebuilding "Star Trek" and has no actual baring on the movie. It's a teaser, I'd try not to take it to literally.
They're assembling the Enterprise with a stick welder... A STICK WELDER!?!?! Is she going to have rivets and bailing wire too???
Steampunk Trek in the flesh...
especially given it was made before filming even began. I think its an atmosphere setter, an excitement builder, an, oh whats the word? teaser.
btw, I love it. nerdgasm-inducingly atmospheric whilst acheiving nostalgia as well. What little it tells us bodes well, I feel.