First off, welcome. Big change from the old Reynolds frame to the new cinelli
. I'll try and give you some help with some of your questions, but someone else should be able to help you out with more detailed information
Theres an article in the articles section which may help you decide wheter its worth it to change the bolts throughout your bike (though it uses generic bolts I believe, not SRP, but should give you a good idea).
KCNC Shimano, while many people are very happy with them, every so often a shifting problem crops up - that said, I have shifting problems with my Shimano casettes, so its probably not a big deal. But its not an every day training type of cassette I believe.
KCNC Pulley wheels - dont see why they wouldnt do 10spd, with the range of touth sizes and that you can run chains and jockey wheels together that were designed for a different amount of gears (I believe).
Try contacting the member Iodupoint via PM if you have any queries about power cordz, he's here often enough that he should be able to help, but many people have them, so someone should help. If in doubt, use search, theres been a few discussions comparing the two.
Personally, I wouldnt try improving a headset, but replacing is always an option (if you can on your frame, im not really sure
Anyway...congratulatoins on the new bike, we're sticklers arround here for a good bike photo, would be interesting to see. Good luck with the racing