You actually only need 14, 14 will give you full AC in Breastplates and Chainmail, though 16 will give you full AC in Chain shirts and Scalemail. You can definitely live in 14, actually, I would certainly reccomend 14.
Note that this build presumes you attain the double-demi status to get 2 DC and 2 AC which may be *very* hard. Until you do so, you are right this toon will be 1 or 2 AC far from the maximum.
And better cross your fingers that assasins dagger won't become a martial weapon when the CEP changes kick in... you won't be able to swop club for martial without spending another feat..
I do not think it is likely. Even now you need different proficiencies with some CEP weapons; e.g. mauls need martial proficiency, wind fire wheels need exotic and assassin daggers need proficiency with daggers. The other weapon feats like improved critical or weapon foci are accessible through club, because club is a weapon *every* class is proficient in. So if you can use some CEP weapon, you may improve it. Let us hope dagger remains dagger however
Yeah, looks like u can cs anythin non crit imm. - Big Crit