The cost would be astronomical, but I'd bet that a carbon pop-top of similar strength might weigh as little as 25-30 pounds.

The easiest way to reduce weight is to remove it altogether.   

I've always looked at the Westys as a "One-Size-Fits-All" sort of solution.   

Designing your own interior to fit your own specific needs and tastes can bring lots of satisfaction, as well as weight savings on furniture and appliances neither needed nor wanted.

http://tinyurl.com/6a493

Fin Beven
'90 Carat, Custom Camping Conversion
Pasadena, CA