[CE 12]Ribbon Customisation

In V8i, I had a heavily customised tasks panel which I have managed to load into CE without any problems. What I am investigating is to see if I can arrange the tools I use in an acceptable manner using the Ribbon.

Starting at my main task, I had 2 rows of tools so I have added 2No. panels nested in a group (set to horizontal) but I don't appear to have any control over the wrapping or width of group.

This is what I am trying to replicate:

Is this achievable?