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AFAIK, it's the lugs and dropouts that are cast and then the main tubes are hydroformed which is pretty cool - then welded - much like an alloy frame.
Litespeed have done some similar forming of Ti tubes.
It's cool. I'd be hesitant to buy a Ti frame that is outsourced though, just because I think there are so many great custom Ti manufacturer's who manufacture in house, by hand for the ~$4000 it costs. But don't get me wrong - it's very cool.
Be inclined to buy a Litespeed if I wanted an unusual Ti frame though:
Love the engineering side of casting a titanium frame, is an interesting method. Has this been done before?