To the OP, the modification slot cost represents a number of things. In this case, it is covering the extensive modifications of
removing the manual controls. Think like this: a car where the rigger is jacked in, the steering wheel turns, the pedals
depress, etc. That is part of the Rigger Adaptation installation :the components that let all that happen and allow the
rigger to control the vehicle using mechanism already in place. Removing the manual controls means you have to
compensate for those components that are no longer there, adding extra electronics, etc, beyond just what goes into
Rigger Adaptation(which also includes the sensory feedback systems for the Rigger, etc).