I know they were trying to be true to a cat-female (with six or eight breasts) but really... six C-cup breasts? Her poor back!
Usually in most cat-as-alien type sci-fi's or fantasy's (or even furry art) they will make the top pair big (be it A-cup to whatever) and the rest usually get shrunk down to A-cup (or made flat almost to non-existance) unless the female character is being drawn/described as "with kits".
I know a lot of people argue when I compare Kilrathi to Kzinti (since the Man-Kzin Wars books came out first and to a degree one is based on the other)... but with Kzinti they genetically re-engineered the females to always have TWO kits at the same time (one male, one female) and are, usually, compared to human females in the chest department (that is to say, the top two are big and make milk for the kittens, and all the lower/rest are basically ornamental hold-overs that don't really work.
Which if you think about it, makes sense. Cause really, I don't care how much stronger a kilrathi is over a human, 6 or 8 C-cup or D-cup breasts is a lot of weight... and while you can argue a female kili is stronger than a female human, you got to remember they typically live under heavier gravity too (1.3 earth g, if I recall).
~~~... just had an image go through my mind of a female kili with their version of double-D's... she probably couldn't even stand upright on her hind-legs due to the weight!
~~~... then just thought of them complaining! If human women have problems finding a good bra and getting them on-and-off... what about a female kilirathi?