I'm sorry, but I don't have the skills myself to make a vanilla cannon. Also, I couldn't compromise the visual quality of the cannon mod because it's easily adjustable and can be used for a variety of purposes. If you're not happy with the work, you can download it, modify it yourself, and redistribute it! If you redistribute it, let me know the URL!

This looks very good but I don't understand the need for mods with such a wide (and good) usage of vanilla parts. IMO make the creation more accessible by only using the cannons pack mod, or, even better, look up how to create vanilla cannons, which is possible using explosives + spudguns for propulsion. Especially with a large turret like on this creation, you'd have enough room.