Forge Version available for 1.20, PLEASE scroll down and read details to make your life easier.
Adds new blocks into Minecraft, aiming for a complete addition of all blocks in older Chisel mods.
Now has slopes, stairs, slabs, doors, etc of any block
Using Templates 2, this is possible, information available: (https://github.com/quat1024/templates-mod)
Factory Blocks Add-On Available
After that you can launch the game, but the first launch will shuffle files to the correct locations, so you need to quit and launch again.
Then it will work perfectly!
Licencing & Attribution
KnowYourKnot ported this mod to Fabric, and I ported it to later versions. This mod is inspired by Chisel, which was created by AUTOMATIC_MAIDEN, ported to 1.7.2 by asie, and later maintained for Forge by tterrag, Drullkus and minecreatr. The source code for the current version can be found here. This source code is derivative of other software that is licensed under GPLv2, therefore this mod is under the same license.