Thoughts on a 1-20 ninja build

[Magicdealer]

I've been considering for a while different ways to build around the sap adept and sap master feats. The basic premise behind this character is that stat-wise he's focused on skills, while he uses his feats and class abilities to supplement his combat skills. Basically, I want to maximize the *I punch you in the face!!!* without going monk. He's thrown together using a 25 point buy.
He'll come into play at level 7 or so.

Race: Human

Str 8
Dex 17
Con 10
Int 18
Wis 10
Cha 15
That's after the racial bonus and stat point from leveling.

Ninja (Bandit Archetype)17/Alchemist 3 (Vivisectionist)
1. Trait: Reactionary, Magical Talent (Light) Feat Sap Adept, Feat: Enforcer
2. NT(Ninja Trick) Unarmed Combat Training
3.Feat: Weapon Focus
4.NT Finesse Rogue
5.Feat Sap Master
6.NT Offensive Defense
7.Feat Dazzling Display
8.NT Combat Trick (Shatter Defenses)
9.F Two-weapon Fighting
10.AT(Advanced Talent)Crippling Strike
11.Feat: Improved Two-weapon Fighting
12.AT Vanishing Trick
13.Feat: Knockout Artist
14.AT Improved Vanishing Trick
15.F Gorgon's Fist
16.AT Feat Shadow Strike
17.F Scorpion Style
18.AT Evasion
19.Feat: Medusa's Wrath,
20.AT Improved Evasion

Couple notes about the build. Vanishing trick, while nice, isn't really needed. However, I couldn't find anything else that I wanted. The character fights with gauntlets, for enchanting purposes. The character portrays himself as a bard, using the light spell to *prove* his bardness.
I picked up evasion at the end because of a lack of anything better I could find.

Supposedly by level 20 versus a susceptible opponent, this guy will have 8 or 9 attacks a round. Each attack will be 1d3(gauntlet) + 10d6(sneak attack) + 10d6(sap master) + 20(knockout artist) + 40(sap adept) + 2 points of str damage(crippling strike).
Sans the markers, it's:
1d3+20d6+60 and 2 str damage. Average damage on a hit of 132 or so. 8 hits would be 1056, though that's probably very unlikely.
Against enemies not susceptible to subdual damage:
1d3+10d6
Or if immune to sneak attack, a simple 1d3 damage.

As long as the target can be sneak attacked, there'll be heaps of ac to go around, plenty of damage to deal. When skill-based stuff comes in, he'll be very useful as well. Versus sneak attack immune, he'll be worthless :P And versus subdual immune, as long as they can still be sa'd, he'll be ok.
His saves are not stellar - excluding reflex.

I really want to avoid sacrificing the 8+int skill points. And alchemist is a no-no in this campaign. Basically anything from pathfinder is good to go, as long as it can be found on the pathfinder d20 srd. Oh, and poisons are interesting, but not really worth adder's strike in my opinion. Cost/effect ratio, availability, and all. Feel free to change my mind about it.
Any thoughts on how to make this guy a better unarmed combatant?

**edit**
Or, I guess I should ask whether this is an unholy abomination that should never see the light of play.

[Bardofcyberspace]

I know this is an old thread but I like the character. With out going monk I not see how to make it better unarmed. Maybe a 3 level dip in monk then take Monstic Legacy. + monk robes could make it better at unarmed. Did you play this character How did it work out for you?

[Bloodwort]

why are you putting so many points into intelligence?

You already get a lot of skill points as a ninja.

I would lower the intelligence and raise your strength.

A bad encounter with a shadow or two and you're dead.