I would have dissagree with you. On the GS430, the starter is on top of the engine in the "V", so no matter how high up you jack the car, it won't help. Having to take manifolds and throttle bodies off etc I would class as very awkward.
I would also class the job on the Mk1 GS300 as awkward. It is very, very tight for space, even just getting the starter out once you have removed the bolts. No idea on the mk2 GS300 as I haven't had to look at the starter on my mk2 yet. However, having looked at the oil filter on the mk2, there is masses of space to get to that in comparison to the oil filter on the mk1, so going by that, I would suspect the mk2 to be better for space. I would also recommend having a few UJ's and extensions, wobble/Bendy bars etc to hand if you are doing a mk1 starter.