I took my first Space Age run very slow, and wound up building this megabase of a ship.
The reason it is so huge is because I wasn't sure just how much ammo I'd need to make, so I decided to build enough infrastructure to allow all the guns at the front of the ship to fire continuously. The ship has a max speed of around 350km/s, but I limit it to 200km/s out past Aquilo to give the guns at the far edges enough time to shoot down everything, since stray asteroids can clip the corners at the front at higher speeds.
At 200km/s, this ship can fly out to around 100000km towards the shattered planet before taking damage. The ship will automatically turn around after taking damage when flying out towards the shattered planet.