Hmmm. One thing seems slightly off (at least to me). The Corvette there would be a bit smaller, I should think, at least to maintain class tonnage. (This is based on the the class for corvettes being any vessel smaller than a frigate and being between 500 and 2000 tons.) I'm just being nitpicky though.
Other than that, it's very interesting, and I love the designs of the ships. Especially that cruiser.