Reinob, your contribution is welcome and precious for this community.
Every contribution is welcome!
I don't know which was the problem with garage the last time you tried, but i think that we (techstaff) can help you if something goes wrong at first.

garage - builder - extras is a complex env that i would not define "perfect", most of times, when something goes wrong, it's not about politics but it's something that we can cure with a chown or chmod.