You want a retro hobby with hacker cred? Try competitive lockpicking, which I'd bet is coming soon to a hipster bar near you. Schuyler Towne is a graphic designer, maker, and lockpicker.
That's him in the video up there showing off his tools. A week ago, he launched a project on Kickstarter, the micropatronage site, asking for $6,000 to begin manufacturing his own line of steel lockpicking tools. He's already gotten over $20,000 in contributions from more than 250 backers.

What explains the response? My guess is that people trained in (digital) security want to understand its physical manifestations, too. Add in the oft-expressed desire of the computer-chained to "work with my hands" and you've got a hot idea.