So after many failed attempts, and just outright going to last save automatically done - I present after 20 days the "Chimera" mutant idea that is illiterate... raised intelligence to 5 and used bombastic perks to raise it to 6 because low intellegence is painful to level stuff. No mutagens yet and looked up chimera traits and added
Strength 11, dexterity 10, intelligence 5, Perception 10
Self-defence : Krav maga
Traits: fast learner, fangs, long fingernails, quick, robust genetics,terrifying, fast healer, night vision,substance tolerance, tough, bad temper, ugly, chemical imbalance, genetic chaos, illiterate, weak stomach, strong scent, high thirst, sleepy, fast metabolism
The character has already killed 1551 and wiped out an orc camp with fang and claw no problem.
Once saprovore mutated then food problems dissappear as I just eat whatever I come across in houses regardless of what it is, water can be annoying but I am sure that if I lab raided enough and push for post threshold chimera I could get "eater of the dead" then I can drink water from anywhere and eat any kill for food
Using magiclysm, mind over matter and xedra evolved
Returning to the discussion on this topic (if low Int is viable) some time ago, I see that you raised almost no skills outside of combat. This char seems to mostly ride on mutations, which is admittedly the dimension of the game I never explored that much. I tend to always go deep into mechanics, electronics etc. So that's why I didn't see much of a path for a dumb survivor build.
So what's the verdict? Low int doable if you do char build mutations, not skills? Your mutations are from Genetic Chaos, not homemade mutagen, right? (I think that's how it works)