The only thing I hate about this car is that I don't own it. You lived up to the name of the thread and even exceeded it, definitely a once in a life time
I have the cp 9:1 and they protrude out the block as well, yours being a custom piston you will want to double check piston to valve clearance just to be safe
If you want a bit more power a turbo upgrade with the supporting mods are a good thing, but the oil pump and sump really aren't something you should be looking doing as a first upgrade
I'd check the Japanese chassie number and ask nissan for what their fast system says before calling people an idiot
Just as a point of interest, a sun roof was not an option for a Gtr