I'll just say I'm more focused right now on the overall layout and style of apps than the entire, section by section detailing of each kcm, unless that's the intent. As such, my mock up of System Settings will have lots of empty kcm sections and icons. I do, however, make or try to make as much of a diversified layout for each environment (full sized desktop, small desktop/tablet, phone/mobile). Again, a lot is based on @manueljlin mock up UI design decisions, the less change in small details the easier it is to update and improve them all at once later on.
{F8669119}
{F8669116}
{F8669117}
{F8669114}
{F8669115}
{F8669118}
All in order of display size and content navigation.