Okay, I just had my biggest derp in a while. I was thinking to myself "Self, why doesn't that missile design show up in the options for 2nd stage missiles?"
"Because you haven't researched it yet you twat!"
Also, how's this for a complete bastard: A size 25 2-stage that has a max range of 864m km, max velocity of 25600kps, has a CTH of 92.2% against ships moving at 10kps+, and releases 4 submunitions that, well, are even bigger bastards that I designed for my stealth corvettes.
They take more space than some entire components, they travel faster than most ships, they consume nearly a whole tank worth of fuel... and they are beautiful! And yes, they have no actual warhead. All those MSPs are going into endurance and speed.
Missile Size: 1 MSP (0.05 HS) Warhead: 6 Armour: 0 Manoeuvre Rating: 50
Speed: 40000 km/s Endurance: 187 minutes Range: 450.0m km
Cost Per Missile: 3.1667
Chance to Hit: 1k km/s 2000% 3k km/s 650% 5k km/s 400% 10k km/s 200%
Materials Required: 1.5x Tritanium 1.4167x Gallicite Fuel x625
Development Cost for Project: 317RP
Missile Size: 25 MSP (1.25 HS) Warhead: 0 Armour: 0 Manoeuvre Rating: 36
Speed: 25600 km/s Endurance: 562 minutes Range: 864.0m km
Thermal Sensor Strength: 1.2 Detect Sig Strength 1000: 1,200,000 km
Cost Per Missile: 25.1835
Second Stage: Hermes-1 x4
Second Stage Separation Range: 150,000 km
Overall Endurance: 12 hours Overall Range: 1314.0m km
Chance to Hit: 1k km/s 921.6% 3k km/s 288% 5k km/s 184.3% 10k km/s 92.2%
Materials Required: 6x Tritanium 1.2x Uridium 32.0835x Gallicite Fuel x30000