I like how we can customize the weapons and power cells on our ships. However, it would be awesome if we could take this further.

Just a rough draft.

So a ship you purchase starts with 1 module. As you progress with experience you can unlock up to 2 more. Sort of like the license system.

Modules would work as follows:

Class 1 = Structure Module, like + 5% armor, +1 cargo, -5% mass, etc.
Class 2 = Maneuverability Module, like +5% thrust, -5% spin torque, etc.
Class 3 = Weapon Module, like +5% damage, -5% drain, +5% velocity, +5% targeting, etc.