You lost me at Xenon-default........Just kidding!
Aaaahh! That makes sense ...after I read it a couple, few, maybe 10, times, hehe
It seems a shame the Base Outline doesn't also control the default layout for the site, so that making a sitewide change to the layout could be done at the base level.
My first Gantry 5 site is nearly finished, I will give Gantry 5 one more try with my next site, probably without using a Rocketlauncher and see how that goes.