This is an elevation detail of the back side of the control frame, shown from the inside of the structure.
NOTE: that unlike the Digi-Comp I, the sense components are mounted on the back of the knex-i-comp rather than on the front like the Digi-Comp I.
Next to each blue/purple composite connector are shown the connectors which are put together to form it, in their approximate orientations in the structure.
The red (arity 3) connectors coupled by the white struts serve to keep the upper horizontal struts from rotating. This is necessary since the bottom end of the sense rods will be mounted here and will apply a torque to these struts.