I was able to finish up the drive for the vertical movement.  The motor pulls the trolley up via a pulley.  Movement up is very slow and I had to PWM the the downward travel to even things out.  I definitely need to get a better motor if I manage to get decent scans with this rig.

The first worm gear was too rough, I had printed it at .3mm.  The new one is printed at .1mm and that makes a big difference in noise and motion.  I had to run a pulley at the top to double up the line and roughly halve the load on the motor.  Still printing off the end-stop mounts but here’s a shot of where I am on the drive mechanics.