Hey that's looking great, much better than what I can do. The NyGuardian tank actually has a rear mounted gunner seat in the back as well. Love the detail you have on this though

Rear gunner beat seen here http://www.furaffinity.net/view/26944159/

Thank you for asking and yes you can draw as much fan art as you like I am happy to know people are enjoying my universe, as long as credit goes to me for the lore designs I'm totally fine with fan art!