GRT Avionics

I'll be receiving my kit(Just Aircraft Highlander)in a few weeks. I already have a "almost" new Sport SX EFIS system for the panel and would like to add Roll/Pitch servo's for AP control. I can easily see added a pitch servo to the pitch control since it is a normal torque tube control. I'm not sure how the Roll Servo will be installed as the controls are cable driven. Has anyone, including GRT, ever seen an installation in this type of aircraft? I'm guessing there are quite a few of this type of kitplanes, such as KitFox, Skyraider, etc. Anyone have any pictures of installations they can provide? Thanks for any and ALL assistance.

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Michael