Re:
Not a whole lot of progress yet, I could pick up a modern drivetrain today but am waiting to see if I can find M900 (yeah, I know not quite period correct) or M739 mechs first. Not going to wait much longer though (summer's not that long), if nothing turns up shortly I'll go modern as originally planned.
I picked up this titanium bottle cage fairly cheaply, a Specialized E-Cage. But it had the normal matt finish which doesn't fit in to the shiny theme, so decided to try polishing it. Anyway, although it was slow going, it came out pretty well. Not quite a mirror finish but close enough.