Ok. So here is what im thinking of making. the math seems to work out to do everything im wanting it to do, but would still like some advice.
8 Sorc/12 FvS
8 sorc for Haste/Firewall.
12 FvS for heals,divine favor,divine power,blade barrier.
THF probably Human? so the FvS heals land for full amount instead of going WF.

Should be able to throw down firewalls and BB's. for mass aoe while divine power/favor buffing and dropping melee dps with greatsword. para weap maybe to stun them into the fields?

Anyways. it would be able to aoe/spell cast self haste melee ok with divine power/favor. and sell heal.

the base stats would be 16 str/8 dex/16 con/8 wis/ 16 chaish. could prolly adjust it a little.

the only problem im having is 3 things i cant figure out if they will be a BIG problem or not.

I will have moderate hp from what im figuring. around 300 at lvl 16.
I will have no DR and low AC. not enough lvls for Stoneskin. and no capstone for FvS DR.
lastly, SP. will have decent SP 2k or close to. but will i burn too much too fast?

So anyone who might know or could give some advice on this.
will i have too little HP?too little offensive power? is the AC/DR lack going to turn me into a glass cannon?
I like the idea of being able to heal/spell cast/aoe/melee all in one. But if it means having to trade every shred of survivability then I don't think itll work at all.

Any help would be nice. thank you.