I have also been working on a Mysterious Stranger 1 / Divine Hunter 11 build.
* You need the Human bonus feat.
* I'd pump CHA all the way up because both classes use it.
* You don't need much attack bonus because you're usually attacking touch AC. I'd drop weapon focus.
* Rapid Reload is a must. Without it, rapid shot does nothing for you. In the short term, you'll use it avoid the misfire penalty for using paper cartridges.
* Mysterious Stranger does not get the quick clear deed, and that really hurts. Two misfires, and your gun doesn't work until you spend an hour repairing it. Before you get a magic pistol, you'll want to stop firing after the first misfire (a second misfire permanently destroys non-magical firearms). To fire more than once per round, you're going to need to use paper cartridges, and those increase misfire by 1. That means that even with a reliable weapon, rapid shot is risky.
* You're going to want a composite longbow as a back-up weapon, and when you do take rapid shot, you'll want a second pistol.
* I would take gunslinger at 1st level.
* Check out the "Called" faith trait. Let's you reroll a 1 on an attack roll once per day.
Stats 20pb:
STR 14
DEX 14
CON 11
INT 7
WIS 7
CHA 18 (+2 racial) = 20 [grit, damage, all saves, heals, etc]
Feats:
1) point-blank shot
1) rapid reload [reload as a move action, or free action with a paper cartridge]
1) gunsmithing (bonus)
2) precise shot (bonus)
3) deadly aim
5) selective channeling
7) rapid shot
9) improved critical
11) signature deed (focused aim)
Equipment [prices shown are upgrade prices]:
Masterwork Pistol upgrade 300gp
Light Armor (For the movement to get within your 20ft touch AC range. Need move actions for reloading.)
Masterwork Buckler
Composite Longbow STR14 600gp [in case of misfires]
Pistol +1 2,000gp ASAP
Reliable Pistol +1 6,000gp ASAP
Headband of CHA +2 4,000gp
Bucker +1 1,000gp
Mithral Breastplate 4,200gp [treated as light armor for movement]
Armor +1 1,000gp
Feather Step Slippers 2,000gp [ignore difficult terrain]
