That's actually not a bad idea. And I was thinking the same thing regarding the illusion of portals moving when it's actually the player moving. If I was to build that, I would have the moving chamber parented by a movement entity that follows path tracks for direction and turning. There might even be path branch redirection. As for gravity, you would need a floor to stand on while the chamber is moving. It sounds to me it is possible. However, if a moving surface goes over a stationary surface with an active portal, as in no gap between them, it might cancel the portal. I'm not sure how far it needs to be away from it. I don't know if it's been done but I'd say it's possible.

It is possible to put portals on moving surfaces but you need to type something into the console. There's also point entities that can invoke console commands automatically when triggered so that the player doesn't have to. I hope this sheds some light on this topic

Cheers.

Well if the great Skyferret thinks my idea is a good one, then I'm happy. (no seriously i love your chambers, thank you for the reply)

PORTALS REDIRECT GRAVITY