When you put it that way, the amount of APILAS does make sense. I had something like that in my mind when I was trying to justify a two-man patrol carrying six APILAS in the standard OOB.
On the topic of laser rangefinders, they definitely are not out of the question at least. The Musti companies currently trained have one LRF assigned to them. Giving them to both Mustis would probably be the only reasonably simple way to simulate their use in pre-sighting targets. The older Musti units would probably have to do without LRFs.
Oh and one more thing about Mustis. The OOB currently has their max range as 700 meters which is probably what it was in the standard OOB too, while mil.fi lists the effective range as 1000 meters.
And a few words about XP/morale bonuses. This probably doesn't affect gameplay too much, but PzJaeg/Mech seems to be missing the standard +2/+1 bonus you've given to operational units. Also sissi troops have a bonus of +10/+3 while recce units have +3/+3. Given how the sissi and recce guys are pretty much identical in training, maybe they'd deserve a similar bonus? And then there's the Coastal Jaegers who according to themselves at least are some sort of an elite unit. And apparently according to regular navy infantry are quite the opposite
And for some reason the Artillery Bn and Artillery Bty have a +5/+5 bonus. This was present in the standard OOB too and I have no idea what it is supposed to represent.
Oh and one more thing. I'm not sure if you've heard about the somewhat new Special Frontier Jaegers. I guess adding them to the OOB would be somewhat problematic as their organization is probably not public at the moment. For more info:
Raja.fi
Keep up the good work, I'm eagerly waiting for a new version for SPMBT v 4.0. I'm holding off updating the main game before I can get a new version of your OOB

- Koh