To get the buttons like that you'll need to use a chat addon. You probably won't need to use kg panels to create the background and borders. Prat 3.0 can do that.
For your toons, in the profile section, create a layout. That layout will appear for all characters until you build another layout and assign it to a character. Don't use profiles, use different layouts.
For the backgrounds yes, in the settings parent it to a frame. You can make a macro
/script ChatFrame1:AddMessage(GetMouseFocus():GetName())
assign it to a hotkey, and mouseover your Skada. The chat frame will show you what it's called. In kg panels options, parent a frame to the name of the Skada window, and anchor it to the Skada window. It's easier to anchor it from the center. Before you do that, resize the window to be at least bigger than Skada. Then you can decorate it, like recoloring and changing the border color and transparency. You can do that for every UI element.
This addon adds Blizzard graphics to kg panels so you have the option of using them:
http://www.wowinterface.com/download...-Blizzard.html