My Wacom buttons and ribbon assemblies were definitely separate from the tablet sesnor, and could be physically mounted in the Contour. Probably horizontally below the keys, rather than vertically in the middle. Note that my active Intuos (stylus only) is likely totally different than the passive (finger friendly) new Wacom multitouches.
I'll see if I can motivate myself this week to open the Intuos and take some pics.