While I'd love to see ship internal added, I think the last thing needed now is to add additional functionality. The game needs a lengthy period of feature stability and bug-fixing, and then look to add more.
Good luck with that.
Elite Dangerous has more than 30 playable ships.
Frontier has had more than 6 years since release to make at least walking in cockpits and transition from the cockpit door to the air lock possible.
That is not a small of work for the 3D artists and coders, and if Frontier wasn't able or willing to do it don't count that it will come in the next 6 years.