Just how to do it with Mcreator? It's a mystery to me. I was did dimensions through a portal. But to make something like the tardis. While it remains a dream
If the mod is for 1.16.5 then you're in luck. You can use the Immersive Portals mod for that, but you won't be able to edit anything to do with the mod. Here's a link for the forge version.
I'm sure it is. Something like a custom dimension or structure buried underground that you teleport to. My bet would be look into dimension.
Just how to do it with Mcreator? It's a mystery to me. I was did dimensions through a portal. But to make something like the tardis. While it remains a dream
If the mod is for 1.16.5 then you're in luck. You can use the Immersive Portals mod for that, but you won't be able to edit anything to do with the mod. Here's a link for the forge version.
https://www.curseforge.com/minecraft/mc-mods/immersive-portals-for-forge
Hope this helps :D