I did read the musl FAQ and its very easy to create a musl libc system. Only thing you must have is normal working toolschain; then just make musl and use the musl-gcc for comiling.

To pkgsrc > I did not say it wouldn't but I don't know how to add packages to pkgsrc but if its easy we can use it for first. But I'm still in the opinon that "no own packmgr, no own distro" :P.

If someone added the packages added to pkgsrc we need just need to way to install packages with pkgsrc from a chroot; and nobody needs to build an lfs.

We can use a xyz-linux-live-cd and follow the basic "arch install".
Just make a few things our own like build the basic filesystem and such stuff.

As init system we can use the init style "Starch" uses.

Reference: https://github.com/StarchLinux/ports/tre.../itscripts
https://github.com/StarchLinux/itscripts
https://github.com/StarchLinux/initscripts

And of course the most important one
https://github.com/strake/init