I updated the tutorial. Looking back at the readme, I think that's probably valid, and I was just confused about the repository split at the time. A Wiki would be great, much simpler to update, which of course means it'd be much more likely that people would take the time to contribute.
A couple of things I've found that helps with builds:
Adding a Tool Argument of -j6 to the cmake options in the QtCreator build allows it to use multiple cores for the cmake part of the build
And something that maybe useful if we don't have kdesudo is to set sudo to run make with no password. This allows it to be added as a QtCreator build process.
in a terminal run "sudo visudo -f /etc/sudoers.d/<file-name>"
add the line "<user> ALL=(ALL) NOPASSWD:/usr/bin/make" to the file, then exit and save - ^X
<file-name> is a suitable file, I used chris-nopasswd and <user> is the user name
now adding sudo make -j8 install to the Qt build will work. This also uses all the cores and builds are a lot faster.