Updated build is as following:
http://underrail.info.tm/build/?HgMDAwkDEAkAAAAAAADCoAAAAABWWjMsWsKgwqDCoMKgIRk9UGIrLBQqZ8KHZiHChB89LgjCt3Ip4qOJBeKsjArfvwI placed Pyromaniac as advised even though I was not convinced by its efficiency as it was triggering too rarely to rely on it. Power Management is not sure to be taken as the last feat, there will be time for reaching it and choose something else.
Throwing is removed. No hacking or lockpicking, the build is designed to fight anyway...
For chemistry and biology, it does not need huge investment to reach high amounts
Crafting skills are not fixed and will depend on quality of materials found, Electronics will be higher than mechanics for example.
Social skills are copy paste from Omni build (Still not sure how to raise it efficiently), are they correct values? It is rather low investment in number of points.
What do you think about this version? Do you see rooms for improvements?
I was also thinking that few points in trap might be useful for some fights> it means 56 points to reach 75 with belt and knife. what do you think? or simple bear trap are far enough as with 3 STR no big carrying possible.
Side note for Omni build > You did not take Psychostatic Electricity on your build, even if you have psionic mania, it is very useful for long fights. I would drop Hypothermia for it.