Personally I'm using the Kolwoon Planetary Militia in my 3140's Alpha Strike forces. My Lyrans getting 400PV of 'lonie infantry, towed artillery, armor*, and VTOLs. Fluffed as being part of an ErztazKampfGrupp throw together to help but more bodies on the frontlines in an LCAF facing hostilities on 6 fronts..
*had to give them Goblins though, rather than custom Rommel APC's. On the otherhand, their vehicle component is two companies strong...most of them Goblin's.
i'm still tying to decide what Militia/2nd line force to assign the 600pv mech force to.
hm, well, let's see....it's the 3140s. If we follow the original Kowloonese pattern, their 'mechs are going to be abusively average designs in the medium to fast-heavy range, probably closer to 3020's era stuff, with poor-to-average pilots. (aka "cannon fodder 'mechs").
not sure you could GET 600 points out of them but it's possible, i suppose.
alternatively, you could assign them as adjuncts to an established LCAF formation in the area, and the best choice in that case, would be one of the MTM units. The toughest part of the mix, is balancing the unit.
If you followed the setup from the Fan Council games, you'd find that there were some hard limits I set on what equipment the Kowloonese could have in their table- I recall limiting them severely on Assault 'mechs (unmodified 12 on the assignment table required) and limited the types available to some real 'junkers'. The table for mediums was slightly better, thanks to the presence of factories in the theater producing a couple of good 50 tonners (the Enfield, which sat on the 5/6/7 position, the Steiner Griffin from 3025 at the 4 and 8, the 2H Shadowhawk at the 2/3, the Bushwhacker at the 9, 10, and 11 (variants), and I can't remember the 12. I think it was some kind of canon energy boat 50 tonner built in the theater.) The "Light" table, if I remember, were a lot of 3025 bug 'mechs with something modern way up on the 12, while the "Heavy" table was just variants of the Blackhawk-KU.
you know, to simplify logistics, because I was actually thinking that way even in that game, and I could see the Ngos continuing to insist on as much 'parts commonality' as possible to maximize every kilogram of shipping space.
In general terms, the Kowloonese would tend to field 'fast' heavies with strong mediums, and keep the scouting operations to conventional assets, while completely ignoring the 'static defense' concepts (aka no tanks slower than 4/6, lots of VTOLs at 10/15, and a doctrine of the best defense being a fast and manueverable offense, supported by heavy artillery in, as the coneheads used to say, "Mass Quantities" thanks to efficiencies in shipping and logistics.)