Here's to a dying game. It's going to be shut down soon, but its had its collection of very badass units.

The Mega Tank, a strong tank with many weapons.
I think it should have 2 seats:
1. Driver, operates the tank and the side rockets
(side rockets fire 10 gravity rockets that work like the dnr mortar)
2. Gunner, operates cannon and MG (Q to fire MG)
(cannon shoots bigger and beefier tank shell, mg just fires fast)
Or up to you.

Concept art of the interior.
EDIT: New information

Tank firing its cannon. Also includes its backside.

Enemy tank firing rockets.