Well, if you really want to be anatomically correct, the legs of the Khajiit should look more like the legs of the Quarians in Mass Effect. Since what most people assume are the knees of the cats are actually their ankles. They walk on their toes and fingers and have very elongated feet and hands and their upper legs and arms are very short, going only a short distance from their knees and elbows to their shoulder and hip joints.
Also since all cats have 8 nipbles they should also have 8 briasts, instead of just the two in Skyrim. But then again, that would certainly make the armor look really strange and the Khajiit bra economy would explode.
But I'm all for making the Khajiit look more feline, but it would make for a lot of work I think.
Well that's my point. But I don't think it'd be so huge of a workload since, as you said, Mass Effect's Quarians show a similar look than what we're looking for.
Then, if we dig deeper into the realm of REALITY, female Khajiits would only have boobs, at the number of 8, when and after they had a baby...
Also, the tail of Argonians could be cut in combat and regenerate.