I see what you're trying to do, but I think it's going to be very difficult to pull it off. You really want the acid curse to boost MinII acid damage and acid spells at the same time. Even so, with a 20 second cooldown on the curse, you're probably not going to stack more than one, and that only nets a 15% bonus on the acid part of MinII damage.
The spellcasting will probably be a little disappointing. Although you can cast acid spells up to 16th level, you're still going to miss out on the sorcerer capstone, so it won't be as effective as you might like. In addition, you'll only have access to up to 6th level spells. That gets you some nice buffs, some nice acid goodies, and wall of fire/ice storm, but you're still missing out on some endgame staples such as Mass Hold, Banishment, FoD, disco-ball, etc. I would say that 6th level grants you self-healing with Reconstruct, but you'll be a helf.
The AA will be nice, because you can get the full line just by being a 20th level helf. I would expect most of your damage to come simply from the AA line and slaying arrows. That said, building all of this is going to take a LOT of enhancement points. Here's an eyeball-minimum:
Kensai I - 11 points
AA (with Slayer Arrows) - 15 points
Savant II - 19 points
So that's 45 points just on PrE (and pre-reqs). You'll probably want to max the acid spell enhancement line, for another 7 points, leaving you only a little wiggle room to fit in things like action boosts, improved metamagic, class stats, and racial enhancements.
When you factor in that you are essentially tying yourself to one weapon category (MinII) because you lack Improved Critical, you'll loose more flexibility and damage potential.
I don't want to leave the impression that it's unworkable, just that there are some shortcomings you should be aware of:
- No improved critical ties you to one weapon
- No toughness
- No IPS limits ranged DPS
- No sorcerer capstone
- No self-healing
- Very tight enhancement requirements
- Low BAB could make hitting a challenge
- Missing end-game spells
That being said, I'd love to hear if you try it and make it work. That would be cool