Calum, Rich

Installed beam splitter baffle.  The installation was a bit tricky at first, but then went relatively smoothly.  

Key lessons learned:

Once you are poised to install the parts, these cryptic instructions will make sense...
1.  Despite a feeling that the parts won't fit, they actually will.
2.  Put the earthquake stops onto the earthquake stop bracket prior to mounting the bracket onto the flat plates.  Failure to do this means a fussy installation after you bolt the flat plates in place.
3.  When putting in the flat plates that are parallel to the barrel of the optic, keep the top mounts loose to incrementally achieve clear alignment on the multiple fasteners.
4.  After installation of the flat plates, it is helpful to slightly bend the aluminum plate to achieve a bit better clearance of the lower prism.
5.  When installing the side channels, fully insert them into their final position prior to putting the H-bracket on.  The side plate will index against the side of the suspension cage so you can relatively easily get the fasteners in without threatening the suspension wires or prisms.
6.  The clearances are pretty small and the stakes are pretty high.  Move slow and avoid coffee.

Other things will conspire to make this installation tricky, but they are not to hard to figure out on the fly.