TehKrush no longer maintains these mods.
Timber! - Last updated for Minecraft 1.6.2 (July 2013), download here: https://archive.org/details/timber-1.6.2
PlasticCraft - Last updated for Minecraft 1.1 (Jan 2012), download here (incl multiplayer!): https://archive.org/details/plasticcraftv3.0.2
HiddenDoors - Last updated by bspkrs for Minecraft 1.5.1 (Mar 2013): bspkr's HiddenDoors thread
Squirrels - RIP, I lost my backup for this, please message me if you have it and I will link it here!
Other mods I made: Mimic Chests (part of "Evil Minecraft"), Terraria-inspired Corruption, MoreFlowers. Helper mods: PortableWorkbench, TorchesAnywhere, CompressedRedstone, GemblockFix.
There is a much more up to date Timber mod by pizzaatime found here (2020): https://www.curseforge.com/minecraft/mc-mods/pizzaatimes-timber-mod
Anybody is free to update any of my mods or use any assets or code from them. I no longer have the sources for all of them though so you will need to use a decompiler. Good luck!
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It's meant to be hard as well, It is the end after all
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I'm not 100% sure but I think you can also use single player commands to change back to normal mode
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