After creating the zen iso on my own time without recording it we can now create a linux-lts iso together.
We create githubs for the iso and the Calamares config.
We build a new Calamares config for linux-lts.
We decide against putting packages on our system because of dependencies (broadcom-wl).
With the use of Meld the creation of a new linux-lts iso is under 20 minutes.
We decide to boot into Mate rather than Xfce4.
We build the iso and test it out in VirtualBox.