Hacker space in Seattle? Which one?
There's https://devhack.net/ in Seattle's U-District as well as Black Lodge Research https://www.blacklodgeresearch.org/ over in Redmond
They're both a far cry from what you're describing. But a lot of it is just putting the work in to build and foster a community around such a thing. Maintaining positive vibes among all members and making it a "third space" for those that want one
Devhack, actually didn't realize they had a site thank you! Definitely not super similar to what I'm describing but yeah inspiring nonetheless for sure.
Glad you had fun! (I was the weird one with all the retro computing gear)
Please feel free to drop in again whenever you're in Seattle!
Heck yeah thank you I can't wait to visit again! I'll bring my kid next time ;)