The Ultimate GNU distro

Hi all! I've read parts of LFS, but I know very little about making distributions overall.
 
Usually, I use Debian, Ubuntu, Fedora, Gentoo, and now trying GuixSD. The BIG PROBLEM that I have with distributions, is that I often find myself jumping from one to another because of something that's available on a distro, and not on others (or because I hate some distro decisions, such as Debian for using systemd). I really hate this, because what I like about the GNU operating system is that I can choose what packages I want (at least in theory). But this is not the case with distros... in fact it seems to me that I must use what's already been packaged, and I can't replace something very easily.
 
I was wondering first of all if it's possible, and secondly if somebody reading this list is able / wants to work on, what I'd consider the "ultimate gnu distro". Basically, an "essential" distro that I can build on-demand with the software that I want, chosen from a list. It could be something very basic, a list where I can choose which kernel I want, which init system, and basic tools. Once I have an "essential" distro build on demand (with only the basic tools), then I can install whatever application I want. But what I'd really like is a basic distro that I can build (choosing the basic component from a list).
 
Would this be possible? Is my email clear enough?
 
Thanks!
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