I did those changes myself to make the game a bit easier.
Xendar is a lot like Bob’s mod, but even more realistic. Instead of iron ore, you get a banded iron formation. Instead of copper, you get a porphyry copper deposit to mine, etc.
Instead of a straightforward advancement through tech, where you mostly upgrade the electronic circuit, you also have to make and upgrade alloys and electric motors, some materials and products have more than one recipe, typically a convenient one and an efficient one, etc.
For example, I am currently making rubber from wood and sulphur, but I am planning to make it from BTX, an oil product, and sulphur, because you can’t farm trees in this mod and having vulcanised rubber leads to red belts and a better first tier electric motor recipe.