I guess required INT is 5 to initiate a Quest to become a mutie. Now since you can get +1 from Armor, +1 from Implant, +2 from mentats, I would start with the completely different special to make it as efficient as possible.
S - 5
P - 8
E - 10
C - 1
I - 1 ( after bonehead)
A - 8
L - 6
now, it's important to know what guns you wanna use, I expect BG, but more like a burster, not flamer aight? (you can use SG with few armors such as PA), therefore your perk set could be as follows:
Adrenaline Rush, Even More Crits, Even Tougher, BRD, MRD, BROA, LG, LG
as a result, after all implants and shit your stats would be as follows:
S - 6
P - 9
E - 10
C - 1
I - 2
A - 9
L - 7
328 hp, 17% chance to crit, 79% normal DR (beer, psycho, both implants, CA) - PE 9 allows you to take both psycho & cig & beer and still have 6 PE (max. avenger range)
PLease note you'd be able to turn into a mutie only after you implanted INT at level 30 human character..