With Gerardo's help, I collected images of optics and baffles in HAM2 from all currently available viewports, with a focus on identifying fiducials for evaluating the input alignment.  The full report is T1700230, and the most notable fiducials are listed below with images attached.

Fiducials of note:

• IO Straight Baffle HA1 - on the reflected beam from IM1 - 15mm aperture (diameter)
  • beam spot on MC3 measures at -5.7mm from center
  • which means the incident beam on IM1 is -7mm from center
  • the radius of the HA1 aperture is 7.5mm
  • with a live camera view, the effect of the beam offsets from center could be checked
  • image HA1_DSC3621.png
• input aperture of the Input Faraday Isolator Rotator through the PRM AR Baffle - ~18mm aperture (diameter)
  • with a live camera view, the input beam could be driven until it's clipped in both directions, pitch and yaw
  • this would give us the most direct measurement possible of the input beam centering
  • the downstream QPDs do not reveal the beams centering due to their small size compared to the FI aperture
  • image FI_1_DSC3618.png, blurry, but shows that it's possible to see entire Faraday Rotator input aperture
  • image FI_2_DSC3599.png, the input aperture is clipped, but the image is in focus
• IO Straight Baffle HA13 - on the REFL beam that goes to HAM1 - 16mm aperture (diameter)
  • with a live camera view, allows for an alignment check of the REFL beam to HAM1
  • image HA13_DSC3661.jpg, HA13 is on the right, single aperture,
  • on the left is the ISS Array baffle with two apertures