One fire control for your 54 AMM launchers and one more for your 40 ASM launchers seems inadvisable.
I do have tons of firecons throughout my fleet for smaller targets.
Still...
Demon class Cruiser 16,000 tons 1255 Crew 3579 BP TCS 320 TH 2500 EM 0
7812 km/s Armour 3-56 Shields 0-0 Sensors 1/1/0/0 Damage Control Rating 25 PPV 86
Annual Failure Rate: 136% IFR: 1.9% Maint Capacity 2097 MSP Max Repair 189 MSP Est Time: 3.53 Years
Magazine 1345
Magnetic Confinement Fusion Drive E7.5 (16) Power 156.25 Fuel Use 75% Signature 156.25 Armour 0 Exp 20%
Fuel Capacity 550,000 Litres Range 82.5 billion km (122 days at full power)
Size 1 Missile Launcher (20) Missile Size 1 Rate of Fire 5
Size 5 Missile Launcher (33% Reduction) (40) Missile Size 5 Rate of Fire 500
Missile Fire Control FC62-R1 (2) Range 62.4m km Resolution 1
Missile Fire Control FC83-R16 (1) Range 83.2m km Resolution 16
'Perceval' Size 5 Anti-ship Missile (120) Speed: 69,400 km/s End: 14.4m Range: 60.1m km WH: 6 Size: 5 TH: 277 / 166 / 83
'Bramble' Size 1 Anti-missile Missile (745) Speed: 68,500 km/s End: 1.5m Range: 6m km WH: 1 Size: 1 TH: 730 / 438 / 219
Compact ECCM-3 (2) ECCM-4 (1) Missile to hit chances are vs targets moving at 3000 km/s, 5000 km/s and 10,000 km/s
This design is classed as a Military Vessel for maintenance purposes
At your tech level a multirole jump capable solo ship is almost impossible.
More like, multi-role solo ship in 16 ktons is fundamentally impossible unless you go lower than 25% engines. Sensors are always huge and they eat up tons of space.
For the Demon CA I would drop all but 10-15 of the size 1 launchers and put the space into at least 2 more firecontrols and the rest as magazine space. This will give you a lot more anti-missile firepower as a 54 missile salvo is almost always going to overkill 1 enemy salvo, which is all you can target with 1 firecontrol. By upping the # of firecontrols you will be able to target more incomming salvo'. I usually go with 1 fire control for every 5 launchers in pd mode, and 1 firecontrol for no more than 10 launchers in anti-ship mode. With at least 2 of each so that I have some flexability and redundancy.
In a precursor engagement prior to this, I swatted all their missiles out of the sky taking no damage at all.
What I noticed was that my AMM firecons were cycling between their loading tubes and ready to fire ones.
The same principle can be applied to my AS firecons for targeting tiny targets like FACs and fighters.