@Luc4cars The weight issues should be addressed with the upcoming global GM platform replacements for Delta and Epsilon, respectively named D2 and E2. The goal is to reduce mass, increase rigidity, and to support cars and same-size CUVs with the same architectures — which is not the case now with Delta/Theta and Epsilon/Lambda being different enough to warrant an entirely different architecture.
Some preliminary info:
http://gmauthority.com/blog/gm/gm-platforms/d2xx/
http://gmauthority.com/blog/gm/gm-platforms/e2xx/
