Your suggested price point is way too high. Large ships tend to be less powerful than the same value in medium ships, hence the trend towards ships designed to be broken apart by hostile fire for 1v1 tourneys.
Docking ships together would be a fun gimmick, but it would do very little to make them more powerful. The only real use I can see is to operate small, disposable fighters with only storage components from a carrier that has all the reactors and factories, and with destructible structure that's possible right now. Docking connectors just allow survivors to be re-docked instead of selling them and replacing them by repairing the carrier. Docking connectors should accordingly be very cheap. I'd suggest a price (including a door if implemented as a room) of maybe 300 credits.
What they would do is allow the AI to know where to separate off parasite craft, which would be invaluable for improving NPC diversity.
