Reaper_77 welcome back to the forums, My advice for your mothership is this, add shields, dont use the railguns, they wont really do much tbh and remove the reactor cluster in the middle. also you can use larger engines for frontward speed. Also, those ion lasers wont help either, maybe fill it up with some more armor. I would also recommend you use weapons such as proton torpedoes to break through hulls and ion weapons to deplete shields quickly. if it helps, you can also cut off certain parts such as shields and make them have their own power source and crew, so that the crew wont need to focus on other things and energy replenishing is as fast as possible.