Let me save you that part. It will not go well.
It fires 8 shots every increment with ~45% chance to hit at the max range of 20k km (energy weapon standoffs are usually in the hundred-thousand kilometer + range at ion drive tech). It also can't see the enemy as you need to have active sensor lock. It also is very crap at anti-missile work, as it won't be able to see the missiles (and enemy will probably be shooting in waves of hundreds of missiles by the way). Also, I just noticed that the max speed for your fire control is only 6,000 km/s, so more than half of your benefit from speed is wasted.
And while yes the fuel support ship helps with fuel range, it being military will be a hindrance. Replace the military drive with a commercial version.
How you can fix the Warhorse for the role you intended;
1) Replace the gauss cannons with turret mounted gauss cannons (and more total).
2) Create a fire control with a lower range but higher speed rating.
3) Half your engines (or at least reduce by 1).
4) At least double the fuel tanks.
5) Active sensors (a res 1, res ~20, and a res 150-200).
6) More engineering space (to at least 15), less Maintenance Storage.
7) Armor up to at least 6 (8 to 10 would be better).
8a) Replace the drop pod with a cryo drop pod.
8b) OR Replace the drop pod with a regular small troop transport and add a hangar. You can then design a really fast dropship that is only a drop pod and an engine.