Hi,
yes, there's potential for a lot of interesting add-ons to be built for Orbiter in this direction. Regarding my "Starship" add-on, I'm still doing "hops" and trying to get the landing a bit more reliable! I do plan to do a "Tanker" variant soon, and then make a start on some kind of re-entry autopilot/guidance. Maybe I should do a "Passenger" variant before starting on the re-entry stuff (I'm not much good at internal cockpits though). I like the video's "hoist" idea for payload deployment at Mars/wherever. I hope ChrisRowland won't mind me mentioning that he was building a stand-alone SuperHeavy booster, which would be useful for launching Starship variants/other spacecraft. And of course there is francisdrake's "Moonship" that has its own SuperHeavy booster.
It would be fun to also have the ground vehicles and base modules/living quarters necessary for colonising Mars or Moon!
And I have this idea, if I can get both parts of Starship/SuperHeavy back to base, of making the cranes required to re-stack and re-use them. But progress is slow - the more developers that get into making this stuff, the better.
Cheers,
Brian