Hey Beast, out of curiousity: Does your guy also mill titanium?
I have no idea, why?
Because titanium is much more...'ergonomic'. It conducts heat/cold much less than most metals. That's why it is often used for watches. But it's much more expensive, but I am curious in how much more expensive^^
It's also MUCH harder to mill (and has a risk of combustion), eats tooling/mills like they're made of butter and cost $10.50 per pound (By comparison, aluminum is $0.85 per pound). It's on par with the toughness of machining 316 stainless steel (which is still pretty hard). Milling aluminum is easy and cheap since the wear on tools is minimal at best.
When Feng did his titanium spacebars, they were first rough cast and then milled. Why? To reduce the amount of material that was needed to mill.
Hate to sound like a ****, but I'm not even going to ask. I'm guessing that the case is already going to be in the +$200 range in alum, I couldn't even guess what it would be in Ti