1 -
http://www.norco.com/bikes/2004bikes/four20.htm
2 - Heavy would be the only concern I would have. Otherwise strength should be more.
3 - No. To be honest, I would expect something steel to be cheaper. That just my opinion though. I don't know to much about production costs. I also, while not a weight weenie, think steel is too heavy for a dually...but that could be a misconception on my part. Especially for a potential trail bike. BMW is one thing, actual trails...entirely other storey.