Here is a tip when designing fleet ships like the bottom ship:
You need weapons on it. What good is the ship if it can not defend itself? If it caught in the open or in a weak group, it will get destroyed in a hurry. Adding weapons will give it a chance of victory.
Also, by adding weapons to it, you can use it as a wall since ships with fleet modules and weapons will draw all of the enemy fire, leaving your other, weaker ships, safe (so long as the weaker ships does not pack too much weaponry that they steal the aggro back).
Just a few tips from me.