>Out of curiosity, was there always an elevator to the defense tunnels
>in the Hutchins residence?
There are elevators to the defense tunnels all over the place. You just have to know where to look...
>Also, was Corwin over ten when he set up shop down there?
Probably. Which is not to say he wouldn't have had a workspace of some kind before then, but it was originally on a somewhat smaller scale, and not underground. He wasn't working on full-size mecha or similarly unwieldy projects at that age. (Or if he was, only on paper.)
Really, the underground thing was just a matter of space, not to protect the neighborhood or anything. It's sort of like Willy Wonka's explanation for why his factory has so many subbasements - expanding the aboveground facilities requires expanding the premises or moving to entirely new ones, but you can always go further down. :)
Benjamin D. Hutchins, Co-Founder, Editor-in-Chief, & Forum Mod
Eyrie Productions, Unlimited http://www.eyrie-productions.com/
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Ceterum censeo Carthaginem esse delendam.