jyl thanks for the info about the innicycle headset.
I just noticed how tight the clearance is with your front brake caliper. That's not an issue with the original Chorus brakes. And at my average speeds, I'm not as concerned about the aero factor.
The La Vie Claire team bikes did have dual water bottle bosses. Only the frames sold to the public had one set. By '86, two water bottle sets was pretty much standard, so going with only one set was a poor decision imho. Another option might be to mount the second bottle with a seat tube bracket (something thin like
these), place the lower bracket over the black band, and paint them to match the down tube? Not super elegant, I realize. The tri below-the-saddle option might work, but then would you mount the spare tubular?
Fwiw:
