I've decided to ditch the zoom lens and just use half the fov of the camera.  

It just makes everything so much simpler.  

The gray cylinder is 20mm diameter and 10mm tall, representing the maximum size part this will be able to handle without generating clearance issues with the swingarm.  The FOV depicted here is 40 degrees.  I expect the larger mirror will be about half this size though as there will be no need to view beyond the maxiumum part size I'm handling.

I've also decided to drive the mirror swingarm with a linkage instead of directly gearing it off the servo.  This allows me to have a hard stop in the deployed position and better protect the servo as the linkage will flex.  It also lets me drive both sides of the swingarm so it can be lighter.

This let me turn both servos on thier sides which then opens up space for my lighting ring to sit.  I think the servos will end up being mounted via separately printed standoffs as it reduces the material considerably and still lets me print it on it's side.

Still working on how to elegantly incorporate a homing switch and then I'll be ready to print this thing.