Look good for starter designs. A few comments:
As Beerstation said, you don't need so much fuel. Unless you intend your military ships to be flying way out away from your colonies just 1 year of fuel is plenty, and you could get away with less than that if you wanted. You could also use commercial tankers to back up military ships with a smaller fuel capacity.
Think of adding some form of missile defense as well. You have 3 choices here - CIWS, beam, or missile. Missile is the most effective, but is expensive because you have to pay for all the anti missiles and keep them reloaded.
If you decide to go with beam area PD, remember to calculate how fast a missile is going and get a sensor and weapon long ranged enough to hit it in the 5 second interval or some might fly right through without being targeted. For instance, a missile going 30,000 km/s would travel 150,000km in 5 seconds - so if you had a area defense set for 100,000 and it was at 140,000 the next 5 sec increment it would hit you and you'd never shoot at it. At early tech final defensive fire is probably best.
You also might be better off with thicker armor instead of early shields. 8 beta shields won't protect against much, that's only 12 points of shielding. A few layers of armor would probably serve you better.
Oh, your PDC lacks an active sensor. And lasers don't work in atmospheres.