I play through two 112 cabs, but am considering a lighter-weight 610 for the heavy/rock band. Not for volume reasons, even one of the 112s is enough for stage sound or practice (we own a pretty good PA). It's more of an image / stage presence thing. Around here, people expect to see gear onstage. A band I’m friends with actually uses dummy cabs for that reason only, they actually play through their IEM system.
But all things considered, I’ll probably stick to the 2x112 solution. Looks “rock” enough for my taste, and is highly flexible for other projects without full PA support, too.
You could get the lightest weight 6x10 box built, hollow at the back, and just put the 2 112s inside.