Important info: Shrinker adds 10% capacity, but it can be increased through adjacent military or hex bonuses. +5% per, adds up fast.
Yeah, In one game I places the shrinker next to a patch of ore that increased my capacity (I forget the name) and +2 to military. To my surprise it increased the capacity on the shrinker, so I built the Hyperion Supply and Logistics next to it as well, and ended up putting military buildings all around the shrinker.
I ended up with +50 capacity from all the ajacencies (I ended up choosing the preparation centre from ideologies just for the +2 to military adjacency) on top of having dense as one of my starting bonuses (+25 capacity) and then the galactic wonder that adds +1 to all adjacency bonuses hit that took it up too a whopping +60 on the shrinker.
After that the galactic event that offers the -10 Ship component mass for Malevolent hit TWICE IN A ROW.
Suddenly I found my ships where insanely expensive, but loaded up to the eyeballs with everything I could ever need. My average "Frigate" class mounted 2x interceptor Carrier bays, weapons, defenses, engines and thrusters and a targeting module on top of that! (something up until that point I could only mount together on a Huge hull!)
As for my large and huge hull ships - lets just say that the cost was -massive- but the sheer force projection was worth it - especially when a Huge scale hull could be a carrier for between 50-70 fighters at a time.
I just wish there where other options to decrease mass and increase capacity - just to see how much I could mount on a ship.