Fenril & Oatboat:
Thank you for your replies. My problem however isn't with setting up my team in Grid right now, it's that I can't get that far. I load both addons but I have no "Custom Layouts" button in my Grid GUI.
I think things would become a lot more clear to me if I could get that to work.

I've downloaded and re-downloaded both addons from Curse, wowace and some other site; GridCustomLayouts is out of date for me from all of them. I choose "load out of date addons" but to no avail.

I have a knack for experiencing problems no one else is.. if only I could monetize that talent somehow..