Have you been talking to Duan at Co-motion? He fit me for my bike. Very nice guy.
Aluminum or Titanium would be lighter. No argument there. Co-motion builds the Americano with their tandem tubing and it's a bit of a tank. But if weight was really an issue, I'd lose more weight and I wouldn't have put phil wood on it.
It was a tough wait for me too and I only lived 40 miles from the factory when I bought it. Skipped my fluid mechanics class to go down and get it. I'm not very good at fluid mechanics anyway.
re-cur-sion ri'-ker-shen n: see recursion