Firstlly i can tell you that there is no common parts on the range roves axles, you would have to modify all the steering links, halfshafts and all sorts. easier to by a kit from many diffeant suppliers or fit range rover axles buty the later is not that easy.
Am in the process of fitting power steering to my series, it is quite straight forward. I have completed most of it you can see it in my gallery under series rebuild, for some information and location.