In order to make ".ukx", ".psa" is not necessarily required.
You can use the animation of ".ukx" of other model which has same structure of bones.
However, there are two kinds of methods for performing it.
a)
Including whole animations taking from the other model in own ".ukx".
However, the models made in UT2003 in this way has the problem which can not respond to new animation in UT2004.
But, you can replace some of animations with custom ones.
b)
Referencing the animations of the other ".ukx".
Since it does not have animation data in, size of ".ukx" can be made small.
However, if there is not the model referred to, your model will not move.
That is, if you uses "Ageha" as reference, "Ageha" also needs to be installed.
Which method do you want to use?