Hobby restoration should be fun as long as you are fine with being the only hobbyist in the full process i.e. vehicle seller, parts dealer, mechanic. denter, painter, etc etc
Why AB60F?
A343F would be an easier option as it was mated to 1KD in some Prado models. This can reduce the work, be more reliable, with an easier drive train sync.
What is your opinion about issues in earlier versions of 1KD? and potential solutions?
aB60f axles mating might be difficult and not sure if the global forums would be on any help either.
With some patience and premium money, it is usually possible to find a good Land Cruiser that requires 10% work as compared to a restoration. Personally learnt it the hard way.