Sorry to disagree, but promoting wood framed structures is pretty irresponsible unless you are yourself a framer looking for work?  Try checking out stainless steel structures, Bones is an excellent alternative and they are running a plant out of Quebec.  Easy and CHEAP to put anything you want on a container home.  Roof - no problem - frame up one side higher than the other, (like a steel mechano set!) and you have your roof.  Not insurmountable at all.