This is just the Universal Blue template, but split out into it's own thing, right?
I was messing around with my own Fedora Silverblue build based on the older template, but it was a lot more annoying messing with the build pipeline and having to rebase onto new commits and stuff than it was to just set up everything I wanted in Arch and call it a day.
I've already scrapped the whole thing already anyway. It's an interesting concept, but it just didn't work for me. It makes sense if I was distributing a specific build to loads of machines, but for my own PC, its completely overkill.
I had to rebase at the time because they completely reworked the bling stuff and scrapped Yafti, so my previously working builds were failing from that point onward, and I just thought it better to return to Arch.