Actually, no, there are missing pieces, where does the flash.sh come from. Any requirements for platform on linux?
For flashing itself the first page is ok, but all the other stuff is fragmented over this forum.
maybe in make file there are insructios, but in that case descriptin what your make does would be good.

The downloading / downgrading android version? Does make do the downgrade + saving the DRM?
What about boitloader unlock as prequisite?