Let's look at some antimatter ships, which allow for some ridiculously good movement performance, if also being quite expensive. These all share the same propulsion packages and at least some of the powerplant; stats assume TL3 except for [CON], as noted:
[CON4] Hilux DE (Destroyer Escort)
1 Twist Drive (Refined)
1 Antimatter Core (Refined)
2 Antimatter Drives (Refined)
4 Pulse Drives (Refined)
1 Hibernation Pod
1 Antimatter Bottles (Refined)
1 Computer Module
1 Scanner (Refined)
4 Coilguns (Refined) (QUAD-COUPLED)
4 Maneuvering Jets (Refined)
1 Gas Rocket (Refined)
1 Carbon Armor
1 Tungsten Armor
1 Heavy Cladding
Cost: 177e (80e) / 32m / 23v / 12a / 0t
IS Rating: 3 / IP Speed: 4 / Range: 1
Init: 1 / Dodge: 6 [PROP3] / Missile: 0 / Armor: 10 / Shield: 0
POSSIBLE BUG REPORT: Strangely Computer (Refined) on this drops heat management by 2 from -1 to +1, so that's why it's not added. Refining Hibernation Pods drops heat management by 1 and armor by 1, so also not added. The power gains don't seem worth the heat gains considering no concurrent mass loss.
Runs a little hot (+1) and the armament's a bit light but it's a fast and evasive bastard with good range and mediocre armor. Can only make a one-way trip without support, but with some tankers and strategy that shouldn't be a problem.
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[CON4] Taro DME (Missile Destroyer Escort)
1 Twist Drive (Refined)
1 Antimatter Core (Refined)
2 Antimatter Drives (Refined)
4 Pulse Drives (Refined)
1 Hibernation Pod
1 Antimatter Bottle (Refined)
5 Computer Modules
1 Scanner (Refined)
1 Radiator
2 Fusion Busters (Refined)
1 Tungsten Armor
1 Heavy Cladding
Cost: 167e (75e) / 35m / 14v / 12a / 0t
IS Rating: 5 / IP Speed: 4 / Range: 1
Init: 5 / Dodge: -4 [PROP3] / Missile: 0 / Armor: 10 / Shield: 0
Rather less nimble but as well protected, and having an unusually good IS Rating, built to keep up and screen from Laserboats.
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[CON6] Tundra DD (Destroyer)
1 Twist Drive (Refined)
1 DHe Fusion Core (Refined)
1 Antimatter Core (Refined)
2 Antimatter Drives (Refined)
4 Pulse Drives (Refined)
1 Hibernation Pod
1 Antimatter Bottle (Refined)
1 Computer Module
1 Scanner (Refined)
8 Coilguns (Refined) (QUAD-COUPLED)
6 Maneuvering Jets (Refined)
1 Gas Rocket (Refined)
4 Tungsten Armor
1 Heavy Cladding
Cost: 216e (97e) / 48m / 29v / 12a / 0t
IS Rating: 3 / IP Speed: 3 / Range: 1
Init: 1 / Dodge: 6 [PROP3] / Missile: 0 / Armor: 26 / Shield: 0
The bigger brother, heat's less of a problem, armament's doubled, and 250% armor, with the same maneuverability and only slightly reduced speed.
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[CON6] Tacoma DGM (Guided Missile Destroyer)
1 Twist Drive (Refined)
1 Antimatter Core (Refined)
2 Antimatter Drives (Refined)
4 Pulse Drives (Refined)
1 Hibernation Pod
1 Antimatter Bottle (Refined)
5 Computer Modules
1 Scanner (Refined)
4 Fusion Busters (Refined)
1 Maneuvering Jets (Refined)
1 Gas Rocket (Refined)
2 Carbon Armor
2 Tungsten Armor
1 Heavy Cladding
Cost: 193e (87e) / 42m / 25v / 12a / 0t
IS Rating: 3 / IP Speed: 3 / Range: 1
Init: 5 / Dodge: -4 [PROP3] / Missile: 0 / Armor: 20 / Shield: 0
Not as nimble or as heavily armored as its equivalent Particle counterpart, but it can keep up and screen out Laserboats.
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Thoughts:
- I'm not sure how I feel about mass and size only scaling apparently linearly with [CON]; it feels like a really forced gameplay mechanic to limit complexity. Acceleration will naturally suffer with any sufficiently huge ship but you can essentially build something as big as you want, if you're fine with it being slow and ungainly as hell. It seems like [CON8] on should feel more epic than merely 2-3 times the size of [CON4], considering the difficulty and time of getting there. Of course, these could just be placeholder values...
- [CON5] lets you make marginal improvements to loadout but it mostly consists of just tossing on some more Armor and Maneuvering Jets to balance it out, so it'd just be some interim template improvements rather than anything substantive.
- I'm not really certain about coilgun damage values unless there's something more to them that's not reflected in the raw damage numbers, it seems really low unless coupling improves it significantly.