This was my attempt at recreating "The End Of Time" from Chrono Trigger on an old server. I think it looks nicest if you place it in the end, though that will nullify the usefulness of the nether portal - so high up in the sky or over the ocean may be nice options for overworld placement, as well. In addition to the Nether portal, it also contains an end portal for your dimension-hopping needs.
The build contains some basic survival conveniences, such as a small wheat farm, chests and a bed. Gaspar, also known as "The Old Man", is present in villager form, keeping watch over the place. You can use it for anything you'd like, just please give credit - and have a great day!
This was made for Minecraft 1.12.2. Java Edition.