Some hackerspaces are much like you describe, although, they are not as well organized to accept low-commitment walk-ins at any hour of the day. But that sounds

Some hackerspaces are much like you describe, although, they are not as well organized to accept low-commitment walk-ins at any hour of the day. But that sounds like an interesting way to keep the space going -- half the space is entry-level fun at a modest price, half the space is the usual craziness.