I would find it interesting if a small-caliber projectile weapon or firearm was created for the game. Would this be possible with shrinking the Old Cannon? This would be fun to affect the different parts of the car by having more accuracy than a three-foot diameter cannonball that is already provided. It would also be entertaining to line up a barrage of firearms and consecutively fire them, thus rendering your ETK 800 reminiscent of Bonnie Parker and Clyde Barrow's Ford B-400 Any thoughts?
the vehicles wouldn't deform in a good way from small bullets, go do some research on the basic concept of how beamNG or RoR work for damage and you will understand why.
Actually, bullets wouldn't deform a car at all, they'd just pass through the metal until they stop and puncture the tires (as you just said, look at the bonny&clyde car). Were they to implement bullet decals and some kind of hitscan system... could be cool to see how many bullets could take to screw up the fuel tank or any crucial part of the engine, but I think the devs have more important things to do than developing realist bullet behaviour pyshics, hah