Very cool! Have you considered adding alternate skins for the tanks or allowing user-generated skins?

I have a start up called Asset Layer (https://www.assetlayer.com/) which is a backend solution to make adding these types of creator economy features simple and affordable for indie games. We have an integration with Unity so you can do all of the asset creation inside of the editor. I'd love to show you how it works as I think it would be a great fit for your game and could help really set it apart!