The topic says all. I saw it was asked before something similiar with ambiguos answer.
Linux from scratch offer a step by step guide to do that.
buildyourownlinux do something similar
Both are useful to learn about linux components and the processs of making a distro customized to your hardware, what it’s cool.
B u t …
those above are not FSF approved
PureOS it is.
So this is the reason of this post. Is there any step by step guide with explanations?
Update: I found this about How to build pureOS