clutch hardware exposed.
However, that the clutch disc, the pressure plate, the release/throwout bearing get replaced is a given.
Whether the flywheel gets resurfaced or not depends upon your judgement or that of an experienced tech whether it needs it or not.
However, I almost always (I can't remember a time when I didn't) have the flywheel resurfaced. (I have not yet done a clutch or had the clutch done on any of my Porsches though.)
The flywheel should be checked to make sure the dual mass feature is working properly. There is a test that can be done with the flywheel on the engine that involves seeing how much movement the flywheel has. An experienced tech should know how to do this test and I believe do it as part of a thorough Boxster clutch job. If you're doing the job yourself and you need this info, ask and I'll look it up and post it.
Now for the other items you mentioned, any items actually that are exposed and easily replaced when the clutch is being done are examined and checked for any signs of wear, early failure, etc. I would not advise a wholesale replacement of those items, but do give them a good check and replace any that are questionable.
Lastly, be sure you follow the guidelines (if they call for this) and apply the proper grease and in the proper amount to any clutch linkage pivot points. I always did this when I did a clutch. It was part of a proper job.
When I had my 02 Boxster in for its RMS I mentioned the clutch's action felt a bit heavy and would the tech when he had the tranny out treat the various points what was deemed appropriate lube to see if this would improve the clutch's feel. I didn't have any info if there were any of these points that should get treated to some grease or other lube, I just wanted this done if it was appropriate to be done. One wants these lubed if the manual calls for it, but lubing points that are not supposed to be lubed is just as bad, maybe worse.
Anyhow, the service manager said he'd pass my request on to the tech. Based on the way the clutch felt afterwards something was done. Now the RMS R&R job occurred around 25K miles, way back in '02. That same clutch is still going strong (along with all the other related hardware) 9 years later and with the total miles now nearly 242K.
Sincerely,
MarcW.