After cleaning all components of flash, I first carefully cut and sawed the left arm and head from body of the kneeling pathfinder (see photos below). The arm went into the bitz box; the helmet was needed shortly afterwards. I also shaved away the grenade and one rail rifle ammunition round from his belt (the remaining rifle round was left on, for the ‘Ui to hang his helmet on).

Additionally, I drilled a hole into the right shoulder joint for later insertion of wire for pinning.
Then it was time for repositioning of the left leg. The original figure was already in a kneeling posture, with the legs in roughly a 90 degree angle to each other. This posture is very stable when shooting. However, it is not “natural” for someone kneeling, while looking straight forward through a set of binoculars. In the latter case both legs should be pointing more-or-less forward.
Therefore, I carefully cut and sawed away the left leg across the thigh joint (yellow line indicated in photo below). As you can see, the metal tab below the feet accidentally snapped off during the cutting/sawing process. This turned out to be a blessing in disguise, as the figure actually became easier to position on the slottabase afterwards:

I then shaved quite a bit of metal off the inner thigh (hatched area on photo above), while continually testing the fit against the left thigh area. This was done to make sure, I would get a good fit when the thigh was repositioned (incidentally, this cutting and shaving operation will become much easier, when/if these figures are re-released as Finecast).
Then I drilled a hole and inserted a length of metal wire into the left thigh and pinned the left leg back in place, only now pointing a bit more forward then before. At the same time, I likewise drilled a hole and inserted metal wire into the left shoulder joint in eventual preparation for attachment of the right metal arm holding the markerlight carbine:

Then I lightly carved the neck of the body to accept the bare Tau head, and superglued it into place.
A small anatomical tip: when gluing the head on, make sure to keep the eyeline (:the horizontal level across the eyes) of the figure
horizontal relative to the base/ground; even though the figures upper body may be leaning to one side (indicated by a yellow line on photo below).
This is done to keep the pose more natural. Notice what happens to persons in real life, who are looking at or focusing on objects in the distance, but whose upper body is leaning slightly to one side: they automatically tilt their heads in the opposite direction to compensate, in order to keep their eyeline horizontal with regards to ground level. This is the effect I was trying to achieve here:

- and (as you probably guessed) my crummy repositioning of the left leg was what unintentionally resulted in the upper body of the Tau leaning slightly to the right. This actually gives him a more dynamic posture (anyway, that’s my story and I’m sticking to it).