As for updates, this is what I'd do:

Update the brakes to something Aero (upper level Tektros are nice and reasonable); this will get some of the cabling out of the way in front.
Get some indexed Shimano Thumbshifters and run your cables under the bar wrap. The only problem with this is the current shifter bosses are lugged right on the frame... Urgh... so it might be better to keep them and learn to reach down to shift.
I don't see fenders fitting in there... now if you built the wheels up as 650B's, put on some Col de Vies... plenty of room for fenders... whoo hoo! (sorry, I'm getting carried away)