I'm just trying to revieve good old bspwm-mate.
I already have an iso, but it still needs some tweaking, as it comes with vanilla mate and bspwm out of the box.
I copied Chrysostomus' config-files from Manjaro bspwm-mate 17.04. over and it really works now.
I am amazed. It is the first time I've been using the Manjaro-dev-tools to create my own iso and it worked relatively well, being entirely new to this topic.