I've run into a bit of a snag, in my first attempt to modify a kit. I'm trying to create a "c" wing for a Spitfire. The kits I'm working with have either the "a" or "bowser" wing. Neither of these wings are equipped with cannon, while the "c" is. I've tried to design cannon, and modify the wing to accept them, with disappointing results. The attached illustration shows what the new parts should look like. If anyone has a suggestion, about how to design these parts, I'd appreciate hearing it.