OK. I see. Well, I guess it depends on the content. I saw the video example and there are a number of variants to display a GUI control or panel in there. I’d say, for simple text controls, you can easily reuse the same control and just change the text input. Same for icons or combinations of icons and text. For the more complex ones, you will need a panel. You can still dynamically update your panel but if it is very different, I would create a new one. The 3D GUI also works with panels and can be interesting to use because it has this cylinder and sphere shape panel that can work nicely with a photodome.
But then for whatever GUI you choose, if you have to make all these different panels/controls as seen in the video, it will be a bit of work. May be the best thing here would be to have the list (or drafts) of all the different types of panels and controls. Next, see which ones could be dynamic and which ones would be only for a single interaction.