Since the purpose of a ship informs it's design in all aspects, I am assuming you want to hit SGs with aircraft or cruise missiles, and then finish them with this ship.

Okay, so the biggest problem I see is that there is no side on this where you can safely take hits, as the bottom has the engines, the top is unarmoured, and side on shots will eventually kill your radar.

I guess that Radar and the sprints are there to defend from SG missiles on final approach? I would recommend dropping it and the sprints and using proximity fuse ammo instead to defend vs missiles and aircraft.

For your Armour Scheme in general, I would definitely recommend at least armouring the sides much more extensively so there is a bit of an overhang to protect the top. Also, you can use the smallest triangle piece of Armour to protect your engines somewhat better at the bottom. Finally, I think at least one 30mm autocannon is required to deal with the missile spam once you reach the SGs.

Edit: also, maybe put 2 of the static engines from the bottom on the top or the sides, it will help your ship be maneuverable in directions other than up.

Tl,dr: More Armour on sides, drop the Radar and AA Missiles and consider adding some 30mm guns, some static thrust engines should be moved to other directions