Originally Posted by tatfiend

As I mentioned earlier most drop bars are larger outside diameter than MTB bars so will not accept MTB bar shifters and other clamp on the outside of the bar type MTB accessories.

Cutting off drops to give a straight bar will not give even 450mm width as road bars are typically listed as measured width center to center on the drops and the bar top forward curve starts well inside that point. I do not know of a drop bar wide enough to do what you want.

The CF bars I have looked at are typically relatively thick wall construction. The light weight is due largely to the low density of the carbon fiber material.