Animatronic Head STL Modifications

I'm updating three Galactic Armory STL files for my General Grievous home animatronic and need precise CAD edits so every real-world component slots in without sanding or shimming. Important: Please scale all three STL files to 72% uniformly before making any modifications, then apply all dimensions below at their real-world values as listed. Deliver the already-scaled files plus editable CAD source. Stand_V2.STL Add a straight 12 mm bore the full height to carry an M10 bolt. Cut a 17 mm hex recess, 8 mm deep, at the base for the matching M10 nut. Place a 15 mm cable-exit hole on the rear face near the base. Throat.STL Mill two pockets sized 40.7 x 19.7 x 42.9 mm to seat MG996R servos; include the M3 mounting pattern (49.5 x 10 mm spacing, 4 holes per servo). Run a centred 15 mm vertical cable channel from top to bottom. Head.STL Per eye (both eyes): an 8 mm camera aperture centred in the eye socket, surrounded by a 3 mm wide, 3 mm deep circular groove for RGB LED strip, starting 3 mm from the edge of the camera hole. Add a 10 mm rear wire channel behind each eye for ribbon cable and LED wires. Inside the mouth: three RGB LED holders, 8.2 mm diameter and 10 mm deep, evenly spaced, each with a 5 mm wire channel from behind. Servos, cameras and LEDs are the only added components, tolerances must match factory datasheets. Preferred workflow is Fusion 360 or SolidWorks, but any package that exports clean manifold STLs is fine.