Last summer, I helped out greenvalv with his Stock Ship Replacement mod for SFC3. He sent me models that needed fixing up (every single one of them needed work done on the break model) and I would fix them up and send them back to him for approval. I got pretty good at working with break models, but I also grew to dislike working with them at the same time. I can stomach them in small doses, but it's long and tedious work (especially if you want jagged faces on the insides of the chunks), and the better you try to make it look the longer and more tedious it gets. I've been meaning to write a tutorial on making break models, but I haven't quite gotten around to it yet.
Ideally, I would prefer that the break model already be done by the time I get it. That way all I have to do is convert it. But I am willing to help you out with making them whenever I have some extra time on my hands.