Heya boat- there's not much activity on this forum anymore, un-fortunately.. I am still an owner on my 2nd actually and both of them needed new power steering racks which required dropping the sub-frames but I can't answer your question. You are referring to the Aveo hatch vs. Aveo5 or now I'm thinking you mean the sedan and the hatch probably..
Maybe you'll get lucky and someone will drop back in and reply. It sure was nice to have experienced mechanics and autobody folks on this forum. Curious, how the heck does a sub-frame get damaged? I've put my cars through some pretty hilarious off roading and logging roads and whatnot, and wrecked the power steering racks, but never damaged a sub-frame.
edit - I didn't make that emoji thingy the forum autocorrects