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Not sure. I've read that anything sewn can never be 100% waterproof, because by nature youre putting a 'shitton' of holes into it (technical term). If you don't have much experience with sewing I wouldnt worry about waterproofing to start. I used a waterproof zip and waterproof fabric, but the seams are so badly done that it would fill with water pretty quickly. Getting even seams in corners is much more difficult than I anticipated
TLDR: maybe
Can you waterproof cordura with wax? I;ve been meaning to have a pop at something similar myself but I'm not sure on the best fabric to start with.