Once I get the kits (any day now hopefully) I will install mine and post heaps of pics in a DIY thread. Hopefully there is no dramas with fitting and it is pretty straight forward.
You are right though, the GTR uses a hard line behind the caliper, where as a GTST does not from my understanding. So not sure how the kits go with bolting up within the different models. If anything I would assume they retain the hard line on the GTR since a hard line wouldn't expand like a rubber hose would, but I do not know, just my assumption.