But I don't like it that way OR it seemed like a good idea at the time

The GZG boys Fleet Book designs have an innate conservatism and balance which is realistic in some ways while being frustrating in others. They haven't been minimaxed or optimaxed, but rather seem to have been designed by a committee anxious to be able to demonstrate that they put in all the things which might be needed, even if consequently none of them are there in decisive quantity.

Nowhere is this more apparent than in the single hangars installed on superdreadnoughts.

Here are a couple of things which you could have instead of a hangar;

• a single arc class 4 beam
• a single arc class 2 graser
• a salvo missile launcher with a three round magazine

Pause here to contemplate what kind of deeply scary ship you could make by ripping out all the hangars on a CVH.

Ships in your fleet can be refitted with other weapon systems at your option. Where the new system is of a similar type and of identical mass, this is treated as a repair and billed accordingly. Where the system is a different type or a different mass, add 20% to cost to take account of the structural changes required. Beams, grasers, pulse torpedo launchers and PDS systems are similar types of weapon to each other. Missile launchers are similar to missile racks. And so on. Hangars aren't similar to anything else, but uniquely can simply be replaced with something else (a single something else) at repair cost (not vice versa). Hull boxes are not similar to anything else, for those of you thinking about weakening your hulls to add more systems.

Refitting can never exceed the design weight of the ship. The design weight of the ship is chosen at the point when it is first constructed and cannot be exceeded for any reason subsequently.

It is open to constructors to make the design weight bigger than the actual weight at launch; but drives must be bought for the design weight of the ship, and deliver that performance. For clarity, that means that you can make a ship with a design weight of 100 and and an actual weight of 80; the FTL drive must weigh 10, and the M-drive will weigh 5 for every point of thrust you want to have. If that weight of M-drive would give the ACTUAL build weight of the ship a higher Thrust, this can optionally be used in combat, but the drive will be subjected to a system check whenever it is used at that Thrust.