Good looking. I'll have to mull it over. Going halfling loses the human bonus feat, which can hamper PrC entry. Requiring sneak attack and 4 feats means fighter with a Rogue dip or something comparable; otherwise the earliest entry for a straight Rogue is 10th.
A bunch of good stuff in there. At first glance there's a bunch of good stuff I'll have to come back through more thoroughly sometime this weekend.
I'm actually trying to base this build somewhat off of a character in an old western, and when I do play him I'll be working on the DM to allow him to have a Hammer of Thunderbolts that's actually a small warhammer, not a large.