What values for melee against chariots, war machines etc.

The Hurricanum is a chariot. Hence, the "crew and the beasts use their own Weapon Skill, Strength, Initiative and Attacks characteristics when they attack. Each can attack any opponent that the chariot model is in base contact with, although the beasts can only fight enemies to the front. [...] The Wounds, Toughness and armour saves of the crew and the beasts are never used — hits are resolved against the chariot's Wounds, Toughness and Armour Save. It is the crew's Weapon Skill that is used for the purposes of the enemy rolling to hit, just as with cavalry" (BRB p. 86).

Regarding war machines in CC: "When it comes time to fight, the war machine makes a number of attacks equal to the number of surviving crew models, using their Weapon Skill, Strength and Initiative. Enemy models strike at the war machine normally, resolving their attacks against the crew's Weapon Skill and Toughness. The crew can then take any saves to which they are entitled" (BRB p. 110). Note also that only a maximum six enemy models can attack a war machine (monstrous infantry/cavalry/beasts each count as three models. a monster (including any rider) as five (ibidem).

Since Cannon and Hellblasters are war machines, they ipso facto have the Move or Fire special rule.  "Unless specified otherwise, all weapons in this section (and all other weapons mounted on war machines) have the Move or Fire and Slow to Fire special rules" (BRB p. 109, updated). 

"War machines can never charge or march" (ibidem), but you do not need to move them sideways: as a single model, it "can pivot on the spot as many times as it wishes over the course of its move [...] without penalty" (BRB p. 27). [Edit: So you can pivot it around, move 4" and then pivot again. As it has moved, it obviously cannot fire in the Shooting phase anymore.]

Against shooting and magic. "When shooting at a war machine, resolve the attack as normal, using the Toughness value of the war machine — the crew are doubtless cowering behind their war machine, using its iron and timber hide to preserve their altogether more fragile ones. The crew's armour save is still used to attempt to prevent any wounds inflicted, as it is they that the attack is attempting to slay" (BRB p. 109).

Well, repeating all the rules all the time would be impossible. Hence, the introduction of troop types. Each model has a specific troop type, and is therefore subject to all the rules of that troop type (unless, of course, specifically stated otherwise). Note also that a name does not indicate a troop type. For instance, the Hellcannon, despite its name, is not a war machine, but a monster.