Welcome to Librarium Online!
i think white dwarf 265 has some useful info. in any case, to make vulture kroot, you can use whfb harpy wings from the dark elf range or maybe the wings from 'nid gargoyles. for the kroot tracker, the head of a krootox and the bodyof a plastic cold one. you might also consider some of those cool lizardmen beasts for steads. hope this helps some.
Actaully, Chaos fury winfs look alot better, as thy actually look like a extra limb with wings attached (but no hands at the end or anything.)
For other things, theres a necromunda model with a good eviscerator, which you will wan lots of.
Hunters and trackers you can extend the barrel of the rifle with a second (lots of extras in the box), remove the spikes, and use the muzzle of the extra gun for a scope.
Other than that, all I can say is use lots of other races bitz, mainly accessories.
Hope that helped a bit.