I can only imagine the ammo supply problems this tank has. Also precision aiming. And heaven forbid if they take a direct hit and it cooks off some ammo.
I think this... thing can shoot and all, but I don't think it supposed to shoot all cannons at once. That would be quite a wounding recoil, up to jamming turret's bearring, tread shredding and even capsizing, depending on tank's and turret's position. Then, there's always exist concepts if uninhabitable turrets.