I believe they're still related but the guys at Nerd Vittles [0] are still doing a PBX in a Box style deployment. Looks like it's called Incredible PBX [1] now. But the last time I ran it it took a lot of considerations around running SIP securely and brought a few of the pieces together. Probably worth a look if you're interested in self-hosting at home or for SMB.
Nerd Vittles is alive and well. And Incredible PBX now offers dozens of free, turnkey platforms. Have a look at wiki.incrediblepbx.com for suggestions.
[0] https://nerdvittles.com/ [1] https://wiki.incrediblepbx.com/