CAD data mistakes

I found four mistakes in the G2Z CAD data.
1-11x8x0.5mm shim:3
not in kit or manual.
2-[a] stepper_plate_left x2 and [a] stepper_plate_right x2
One of the FHCS holes is misaligned.
3-stepper_mount_left x2 and stepper_mount_right x2
Bearing holes are misaligned.
4-belt pulley is not positioned directly below the Z idler.

Start by locating the G2Z CAD data and comparing the listed shim, stepper plates, stepper mounts, and belt pulley against the kit and manual. Review each of the four reported discrepancies and confirm the corrected geometry against the relevant hardware. Done means all four CAD data mistakes are resolved and the kit or manual no longer conflicts with the model.

Written by the indexing model from the issue text.