You could always just go hard and be really OP yourself.
If you (or anyone else) would like to see a custom tank in this game. You can always make the model yourself, sound settings, textures, objects.ddb associated with it then test it and give it to Kaskins when you feel it's complete. There are currently a billion things he's trying to do on his own in terms of balance and new things. So making a whole new model by himself whilst balancing work isn't exactly easy. Doing it yourself though will grant a greater chance of it happening.