Connecting Demention to demention and Unlimiting block build limit

I had a cool idea for the game if this can happen some time, why not upgrade the game from The Nether, to Overworld, and to Sky World (for sky builders), to The End. Would be nice to have like at least 8 dementions, and making 8 different portals, seen a video how The End upgrade would look, so nice! Why not starting from The Nether usually portals are created to go there and The End connect to the overworld. If you want just leave the cords as it is using the overworld. What if we dig down to -64 as it usually is and instead of using bedrock to block the area, take it off and just lead it to The Nether, then if we are going up, instead of using the building limit to 320, let's build and go higher until we reach The End for the ender dragon. It's like a tower for example, 1st is The Nether, 2nd Overworld, 3rd The End, maybe 4th The updated End. Keep the portals as it is if we use them. But we can still leave the spawn to the Overworld as it is. Also lets say we take a portal to The End and instead of falling to the void we land in an ocean or ground on the overworld.