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.
Just from looking at it, I feel it would be more useful as an armored artillery piece rather than a tank, just look at that elevation on the guns and oversized optics! What's more look at the sniper rifles they are all carrying, clearly they are planning a long-range engagement.
Nice picture mars expedition is always facinating.