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Well, I fired coil-gun (on Warsaw University of Technology few crazy students build small coil-gun or I would say coil-rifle), recoil is smaller than in standard weapons, but still significant (projectile is short range and muzzle velocity is twice of that of air gun, projectile caliber is 10mm, aprox. 20g). It's hard to say what it would look like on larger scale (that thing what I used had aprox. 15-20cm barrel).
1). I said that it would be smaller round, not 3000t! I think, it would be something like Onager round (or larger) with higher velocity (Onager fired at velocity aprox. 15000 m/s - 1.1GJ of energy).
Projectile 1t with speed of 3000 km/s (1% of light speed) delivers 100 times less energy than 100t projectile fired from destroyer class MAC gun. Pillar of Autumn was equiped with MAC capable to fire 3 rounds, each round had mass of 180t.
For me is still possible in this matter, especially that MAC round was approved to destroy Spire.
2), 3). Well, I think it is not a problem. Imagine using only one gun at a time, to aim the target you use orientation of ODP - thrusters.
Well, planet side MACs may be for security reasons. You know that Covi had stealth corvettes and UNSC had also stealth ships (rebels may also have similar). You can track target via radar if it is not jammed. In Halo: Reach no one saw incoming Covenant corvette which deployed Spire and masked approach of Assault Carrier. Humans realized threat like that is possible.
Military personell have this tendency to follow rule: Victoria amant preparatio.
MAC platforms above Reach were in too small number to cover whole planet. UNSC prabobly placed them near high priority targets such as military base, power plant.
Using ground-side MAC guns was prabobly much safer than deploying nuclear charge into the same area.
Still, most of this is still speculated.