Does anyone know of a source for a longer French-threaded cartridge? Also, does anyone know what size cartridge I'd need?
It looks to be a high-end bike; perhaps you can justify splurging on a Phil Wood bottom bracket?
If I go with a conventional cup and spindle set up, does anyone know how long a bottom bracket spindle I will need? Bottom bracket is 67.8mm, so it's a 68mm I need if that helps for calculations.
The Campagnolo triple spindle was 122mm long, so that's what I'd suggest. Phil bottom brackets can be adjusted laterally to optimize chainline.