I've built something similar to this for an NPC human. Went something like Rog3 / Mnk1 / Rgr1 / Asn1 / Inv. Blade2 / Mas. Thrower1 as final stats, but powered him down due to party level. Monk was great style, got four d6 dies at 9th level, and I allowed Sais to work with the Invisible Blade style because it's "close enough" (Go rule zero! W00t!)
The main problem with Master Thrower for a dedicated sneak attacker is the BAB requirement. The easiest wasy to it is Rog3 / Fgt2 / Class with Good BAB 1 / MT1. You get two feats to get anything with, plus the abilities of the other class. I suggest Swashbuckler (which later helps with the requirements for Invisible Blade, if you wish to go there) and picking up Far Shot and Two Weapon Fighting.
A few questions, though:
1) If you feint someone with Uncanny Dodge, do they lose their Dex to AC?
2) Invisible Blade eventually gains uncanny feint as a free action. Does that mean once per attack, once per round, or "until he gets it right?"
3) Master Thrower eventually gets Trip Shot. It seems by the RAW that he can make a trip attempt with EVERY shot, and still do normal damage with the same number of attacks per round. This smells of cheese, am I right with my interpretation?