I own two Ti road bikes [Litespeed Ultimate, Fuji/Sandvik metal works] both have carbon forks [Look] and one has Graphite Paul Lew 4quad wheels. The characteristic of both frames is the expense [L=$2400, F=$1750] as well as welding them in Argon gas environment plus they adsorb road shock. Weight wise you may save 15% or less depending on the stress loads placed on the beams/mast. The Russians have a machine makes huge wing sections for their C5A bus. They offered ti to a couple of suppliers a few years ago. They maybe approachable today if you can handle their minimum qualties.

thom