I'm making a monk duelist tank.  I used the point system for ability scores to customize it.  With Svirfneblin racial modifiers and 3 4th level advancements (12th level), but disregarding magic items, the ability scores are:
Str 5, Dex 22, Con 13, Int 12, Wis 16, Cha 3
I can live with being a social outcast and having a low charisma.  Also I have the "weapon finesse" feat and "small but deadly" feat, so a low strength doesn't affect me offensively.  The only drawback is that I have a carrying maximum for a light load (which I intend to have) of 12 lbs.  My AC is really good, so I can tank.  Additionally, I manage to compensate for not having any strength bonus to damage with "Hammer the Gap", and the duelist ability precise strike and magic items.  For example I wield a +5 cestus, which only modifies my unarmed strike with the +5 bonus, but lets me use my monk level for damage and stunning fist.  Then I have the amulet of mighty fists.  If I use the amulet for only weapon abilities, both items stack in a cost effective way.