Yes SMGL is still active. You can try joining one of their channels. There are still people looking for source based distros, not sure while Gentoo is the only thing that pops up for them. I used it for some time, and it's fantastic. Sadly having to build stuff takes too much time, particularly on old, and not performance oriented HW. They had support for binaries, and actually include a binaries grimoire, so you could install binaries that used to take too much time, like Firefox for example. Still it takes too much to keep a source based distro. And if you go all the way, then when changing parts of the building toolchain, like gcc, the recommendation was to build everything so that everything would be built with the more up to date toolchain, that was cool, since SMGL has tools for it, but those fancy stuff take as well a lot of time. There I learned 1st about ccache, hahaha.

Sooo fun, :)