Carrier's are for sissy girls. Real mean build Titans.
WHAT WAS I THINKING!
Also on the side and why most people only bother building them once they get some serious moolah rolling that they want to throw into the wind, they're not cost effective. You can get multiple motherships for the cost of 1 titan, and 4+ motherships in a system is loving scary with their warping cruiser-equivalent drones that chase you if you try to warp out. Or you could just buy 30 dreadnaughts and plow over a few systems.
On top of that, geared battleships and some really tank specialized battlecruisers can actually tank a doomsday weapon. I was in fleet battles where the enemy had two titans with different damage types (EM and Thermal I think the second was) and we had battleships fitted to tank two simultaneous doomsdays. That was before the nerf, when Titans could just remote detonate a doomsday anymore in a system as long as some gay turkey opened up a cynosural field. Now titans need to actually go into a fight to use a doomsday, and contrary to popular belief they can be warp scrambled with interdictor spheres so Titans can easily be forgeted over by a fleet of crazies. One thing they're good at is giving a nice fleet bonus from far away, safely tucked in a station's shields, but that's pretty much it. Oh and I guess remote warp fields is nice too.
But who the forget cares I want me a space snake now.