well then, allow me to address your points with constructive editing of the design
You're BASICALLY making a militarized city bus.
It's so huge, it'll get stuck everywhere and in everything. Imagine trying to drive this thing through the jungle, or the rubble covered streets of the cities.
Plus, imagine how expensive it would be. And how hella slow it'd be... etc.
in reverse order: for purple, the v16 should take care of the bus very well, especially considering it's supercharged; as per blue, it shouldn't cost a lot (1 base cost, 1 for supercharged engine,
possibly 1 for the armor for ore, 2 for oil)
orange however is a very valid concern, therefore i'll attempt to revise the design right here
BATTLEBUS IFVa treaded bus, armored with 3 inches rolled homogenous sloped at 20 degrees; carrying 36 soldiers and four stallion machineguns on the sides with a reinforced plow in front, designed to sweep everything in its path out of the way
fitted with a supercharged v16 engine and tiger-inspired gear system for optimal all-terrain movement
we replace the anti-tank capabilities with anti-terrain capabilities and presto
i'm really open to changing the battlebus, as a bulk troop transporter is something that would give us an important logistical advantage i believe
2. It'd be extremely heavy.
4. Ever seen a bus tip over?
5. Four machine guns and a cannon is, in my opinion, too little for something so huge.
points i consider already addressed omitted, feel free to point them back at me
#2: i believe the sheer size of the treads demanded by the size of the bus should make it easy for the bus to operate in most environments
#4: i have; the armor being sloped at 20 degrees should make it very hard for the bus to tip unless directly off of a cliff
#5: putting more weaponry on the battlebus would make it even huger and forfeit its role as a vehicle that moves infantry in favor of a vehicle that replaces infantry