[DISCLAIMER: The following rant is not meant to deride, ridicule, or otherwise impunge Swamp Fox's build. It is merely a diatribe on the classification of said build. And yes, I've had a lot of coffee.]
As an erstwhile deshi of the Kazikure Ugi, I must respectfully observe that the "Rattrap" build is not a "ninja".
Sure he has stealth an can disguise himself and has Killing Hands...but his highest weapon skill is with Heavy Pistols? I'm going to assume this character is not RAW (Ways aren't RAW, unless I am mistaken) yet no Sensei Positive Quality, no Martial Arts? He's only got one blade, and it's some generic, off-the-shelf ceramic knife (probably from some factory in China).
His Contacts are all Fixers - nary a mention of a Clan. He speaks several languages, but none of them are Japanese. His Knowledge Skills pertain to mercenaries and politics - which is fine, but he should have artistic and/or crafting knowledge/abilities to round himself out. His gear list reads like he's planning on blowing up entire buildings, and his commlink could be hacked by a middle-school student.
I'm not trying to say it's a bad build - I'm sure he's a very nice assassin/terrorist with mystically enhanced disguise and stealth. I'm just saying that a ninja doesn't have Bad Rep and Records on File as Qualities!
Infiltrator? Very nice. Ninja? No, not really.