You will notice, if you try to set these up, they could be a bit...light.
Especially your considered Dreadnought. If you want it armed to the teeth, with parasites, CIWS and THAT much armor (bit on the "much" side for the armor, by the way) it will be nigh impossible to get it even close to 25k tons...unless you want it going for 2 million kilometers at 50km/s and break down twice in that distance.
![Grin ;D](http://aurora2.pentarch.org/Smileys/classic/grin.gif)
With the sizes you considered, you'll always tend to end up on the light side in some regards, mostly in armament tho.
Little example of my own:
Ticonderoga class Missile Cruiser 15 000 tons 527 Crew 6816.35 BP TCS 300 TH 180 EM 840
7500 km/s Armour 9-54 Shields 28-240 Sensors 72/72/0/0 Damage Control Rating 48 PPV 90
Maint Life 9.06 Years MSP 5112 AFR 100% IFR 1.4% 1YR 112 5YR 1680 Max Repair 400 MSP
Intended Deployment Time: 12 months Spare Berths 5
Magazine 1258
General Electric LM-250 (9) Power 250 Fuel Use 15.2% Signature 20 Exp 10%
Fuel Capacity 300 000 Litres Range 23.7 billion km (36 days at full power)
Theta R240/153.6 Shields (7) Total Fuel Cost 45 Litres per hour (1 075 per day)
CIWS-600 (1x16) Range 1000 km TS: 60000 km/s ROF 5 Base 50% To Hit
Lockheed Martin Mk 48 Mod 0 SLS (20) Missile Size 6 Rate of Fire 40
AN/SPG-65 Missile Fire Control (2) Range 360.6m km Resolution 20
Perseus ASM (158) Speed: 90 000 km/s End: 31.4m Range: 169.6m km WH: 36 Size: 6 TH: 1050/630/315
Kingfisher ASM (20) Speed: 171 500 km/s End: 32.2m Range: 331.2m km WH: 25 Size: 6 TH: 571/343/171
Sidearm ASM (30) Speed: 90 000 km/s End: 19.6m Range: 105.8m km WH: 25 Size: 6 TH: 300/180/90
AN/SPY-1A/B Active Search Sensor (1) GPS 6400 Range 343.5m km Resolution 20
Thales Mk 1 Thermal Sensor (1) Sensitivity 72 Detect Sig Strength 1000: 72m km
Thales Mk 1 EM Sensor (1) Sensitivity 72 Detect Sig Strength 1000: 72m km
ECCM-5 (2) ECM 50
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
Obviously it's somewhat higher-tech than what you currently have available, but the principle doesn't change. I always keep my cruisers at around 14-16 ktons. On lower tech levels, they'll simply be slower and deal less damage. You just have more room to put stuff in, if you scale everything up a bit.
My carriers typically weigh in at around 40k tons, with a strikeforce at around 30 fighters, depending on fighter size. But I don't start making fighters until at least Magneto-Plasma drive, mostly even higher, because I find below that, I don't quite get the combination of speed and armament I would like out of a fighter.
My escorts tend to end up at around 10-12 ktons, because I like ships that carry point defense weapons in sufficient amount (at least 2 quad Gauss turrets, more if I can get it) AND anti-missiles in the same hull. I just don't like devoting two different classes (and therefor) shipyards to what is, in effect, roughly the same role.
As with everything in Aurora, it's a matter of personal preference and what works for you. But for me personally, your ship sizes would be awfully small and I'd have to compensate by using (and losing) LOTS of them, which in turn complicates things like resupply and more importantly: squadron transits.