I think that a TARDIS mod would be an obvious, but awesome mod for Starfield! Starfield even makes it seem like it's supposed to be in the game! Immersion wouldn't even be a big problem because you can go to different planets already! Being able to travel to different planets by piloting the TARDIS would be INCREDIBLE! Time travel is difficult to pull off in a game, so you wouldn't even need to worry about that (but if you wanted to, you could make it so that you can reset the flag that says you haven't been to a location before/It's your first time there). It could also be a really cool home too! I think this would be an awesome mod if done right! please consider this idea!