Klaus did mention once that "I haven't seen my wife in years" so I like to think Gil has a mommy.
I think with when the America's dropped contact, the timing was off for it to be Thundering Engine Woman. I'll have to check the Blueprints next time I'm home.
Part of that was she sounds really cool, and I hoped she would show up at some point.

Ah.

He even has a hat!