I don't know if this is off topic and will happily remove this if it is, but I'm looking at running a one shot with some friends who I regularly do star wars with, and one of them really, really wants to play a Ratling, so I wrote a custom archetype/background for it. I'd appreciate any feedback people here have with regards to its balance and feel, as I'm not that familiar with Ratlings at all. 
Ratling Background
Br 1; Ag 3; Int 2; cu 2; wi 2; pr 2;
Wounds: 9+ brawn (+5xp)
Strain: 12+ will
XP: 100
Natural sharpshooter: Ratlings begin play with one rank in Ranged (heavy). They may not train this skill above Rank 2 at character creation. 
Silouette 0: Ratlings are much shorter than unmutated humans and count as silhouette 0 (-10xp?)
Scorn the Abhuman: While ratlings are imperial citizens. They are looked down upon, both literally and figuratively, being seen as lazy, lecherous and all around inferior to true humans. All social checks to interact with imperial citizens take one setback, two if the citizen is particularly offended by the ratlings mutantcy. (+5xp)

Oh, dude, I am literally running that right now. Just did character creation and the first part of that adventure this week. Thanks for this!