Because you are working with such large panels and very little deformation, you can use flattened quilts to come up with very close results.
Are you planning on merging the sides and back to a single piece and welding the seams?
There is a lot to consider when designing such a hull. You might even think of stopping by the local hobby shop and picking up some brass sheets. You can print on these and cut out your patterns and solder them together. This will give you an idea of what kind of deformation you are dealing with.