More than the professorial experience, I claim that the great success was due to this incredibly clear document:

D1201390 

in which all the relevant details (which optic, where, etc) are summarized. 
So far, we installed only the optics which are strictly necessary to route the PSL, ALS and REFL beams to the ISCT1 table. 

The REFL path to the sled and the POP path to ISCT1 and the in-vac LSC diode have been blocked by a V-shaped beam dump (grey blocks in the drawing).

Broken black glass story

Before moving periscope assembly to HAM1, we've noticed that the black glass behind the top periscope mirror was getting loose. On a closer inspection, it turned out that actually the glass was completely broken and the larger piece was held in place just by a friction. The first picture shows the J-clamp with the broken shards of black glasses in the slot. We also observed a LOT of glass powder on the mirror, but fortunately this was all in the back (second picture). Lisa recleaned the mirror, we put another black glass, and everything was fine.

There could be more than one cause for this. Matt and Lisa noticed yesterday that the metal screw to hold the black glass was grinding and making some glass powder, so maybe we need to use PEEK.

Another thing is that, when tightening the J-clamp setscrew for attaching the J-clamp to the mirror holder (as opposed to tightening the screws for the glass), J-clamp moves in such a way that the black glass moves laterally towards or away from the mirror. If the tip of the black glass is already touching the mirror mount, which is hard to avoid unless you pay some attention, the J-clamp motion puts some torque to the black glass. So we need to make sure that the black glass doesn't touch the mirror mount.

And the slot in J-clamp for the black glass is too narrow anyway, sometimes you need to press it in really hard, sometimes it doesn't fit at all, and that doesn't help things. We need to make these grooves wider.