R31 tie rod ends into S13 spindles looks spectacularly dodgy. You either have a castle nut with no split pin in it, or an upside down caslte nut, either way you don't get many threads on it. Thats the sort of thing I would expect to fail a RWC, but hey, I may be wrong
Not if he re-uses oil and a filter from his GTR or something
hmmm... might take a 'strayen day...