Description
Create a parallel world for the overworld and the nether.
Similar with Overworld Mirror , but it not work at 1.7.10. I play 1.7.10 with mod now so I wrote one, and add additional dimension for nether.
Use hay bale to create portal to enter parallel overworld.
Use soul sand to create portal to enter parallel nether.

Exactly same as original world terrain generation unless you change the "seed_offset" in config file.
Mod ores and structures or biomes will also generate in parallel world.
Activate portal with:

Source code:https://github.com/HuJK/MCMod_Parallel-World/
Change log:
1.0.0: Firse release
1.0.2: Fix MCreator bug (Too many zombie pigman spawn in portal block)
1.0.3: Remove some useless code generate by MCreator
1.0.6: Change config filename from "prallelWorld.cfg" to "ParallelWorld.cfg"
1.0.7: Fix MCreator bug (Portal block is ubbreakable in survival mode)
Fix the biome of Nerher is not hell
1.0.8: Fix bug for incorrect xp display
Mods made with MCreator.
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What means Verified?
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Compatibility: The mod should be compatible with the latest version of Minecraft and be clearly labeled with its supported versions.
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Functionality: The mod should work as advertised and not cause any game-breaking bugs or crashes.
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Security: The mod should not contain any malicious code or attempts to steal personal information.
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Performance: The mod should not cause a significant decrease in the game's performance, such as by causing lag or reducing frame rates.
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Originality: The mod should be original and not a copy of someone else's work.
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Up-to-date: The mod should be regularly updated to fix bugs, improve performance, and maintain compatibility with the latest version of Minecraft.
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Support: The mod should have an active developer who provides support and troubleshooting assistance to users.
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License: The mod should be released under a clear and open source license that allows others to use, modify, and redistribute the code.
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Documentation: The mod should come with clear and detailed documentation on how to install and use it.
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How to Install
Download Forge & Java
Download Forge from the offical Site or here. If you dont have Java installed then install it now from here. After Downloading Forge you can run the file with Java.
Prepare
Lounch Minecraft and select your Forge istallation as Version this will create a Folder called Mods.
Add Mods
Type Win+R and type %appdata% and open the .minecraft Folder. There will you find your Folder called Mods. Place all Mods you want to play in this Folder
Enjoy
You are now Ready. Re-start your Game and start Playing.