Would suggest a build like this maybe:
http://underrail.info.tm/build/?AwGloJgVhBmECMAWEB2OICcH0NjJGcMNGBYCEADnSgDYS6UFpFWqGozXjeSJKrCOgjZYDWFTjYkUrmkqp4qbFXiZYQAhuxkey for 135/135
This would have more of a focus on smg's first turn rape fest than poison and disable
Gear:
Infused Siphoners Leather Armor 15% armor penality (soft padded with Kevlar coat or Black Cloth) Infused Siphoner Tabi
Steelcat 8.6mm with Smart Module, and Muzzle
Jaguar 7.6mm with Smart Module, and Muzzle
Jaguar 5mm with Smart Module, and Muzzle (possibly Silencer instead of Muzzle)
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Another suggestion would be dumping smg's altogether and going for a pure knife thrower build:
http://underrail.info.tm/build/?AwGloJgVhBmECMA2RoAsdMHYyNjcXJATjxgA4UoFcpyyHKQoYF9dDOQIJuYIcEUrBSx6sUmnpYaWXuRrl6xeMTRAhuxkey for 135/135
I would go for as much dex as possible as dex reduces the ap cost of throwing knifes
I guess it would be interesting but more challenging also im not sure how many enemies are poison immune in the game
with feats like
Blitz (convert all movement into action points pop adrenalin = more knife throwing = more split spare = more poison = more suffering for the damned)
Pinning (seems cool to poison them and than pin them while running away, if you get suprised and are unable to lay some bear traps beforhand)
Split Spare (multiple Poisoning with one throw)
Fatal throw (finisher for ap reg so you are able to keep throwing would be your mop up)
maybe ripper (but I don't think this would be a crit heavy build)
Quickpockets (could be worth it, you got more slots for more knifes/grenades + ap cost reduction for equiping if you run out)
Gearwise I would wear the same as above. Start out with a tacvest and switch later on to infused leather
Skillwise put the gun skillpoints fully into throwing, evasion, stealth, mechanics, Electronics and Tailoring
You could use crawler poison caltrops for stunning, bear traps for immobilise and posion stacks + gas grenade/Split Spare than hide wait for dot ticks and fatal throw everyone to death. Don't forget to mix in some caveear poison for that 50% more dmg. Keep some Emp's rdy for robots.
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Hope it helps!