I was wandering aimlessly around the internet and found the Hexcel web site.

They have a lot more products than they use to have, one of which is pretty much made for uses as BMW .

http://www.hexcel.com/products/indus...exmc-materials

There is a chart there which shows Hexmc as being a bit stiffer than

Steel and about half the weight of aluminum. And slightly lighter than Magnesium.

Dan