Not a bad first attempt!
Here's a 1.2 bil ship I made to compare:
Attack: 379.991.223
HP: 1.024.005.091
Accuracy: 92%
Absorb: 69%
Considering that my bonuses are maxed, your ship has comparable strength.
Changes that I might make on yours:
Set the weapon accuracy to 55% - this is the most efficient accuracy for a weapon to use (you will get less attack but the increased accuracy will make up for it)
Use a shield setup like:
2x 28%
3x 29%
2x 30%
1x 31%
1x 32%
1x 33%
And a computer setup like:
1x 13%
3x 14%
2x 15%
2x 16%
1x 17%
1x 18%
If you need the specs for the shields and comps, here is a list of them!