The Modular Systems Mod enhances a few blocks to better improve their functionality.The furnace expansion allows you to upgrade the furnace to improve smelting/cooking time, use less fuel per cook, or multiply your outputs. It will improve depending on what type of blocks you use to assemble it. You need to build at least a 9x9x9 cube with the center empty and the front center block as the modular furnace. With Cobblestone this will just act as a slightly improved furnace. But if you built with diamond blocks it will significantly increase the speed at which it outputs.
You can also add a crafting table to the furnace as well as an Addition Expansion block that will allow you to smelt/cook more items per burn time. So if you have one Addition Expansion block as part of your furnace system then it will output two items every time the smelt completes.
The Modular Storage is a great feature to improve standard chests. Already the basic modular storage chest adds a significant improvement to how much you can store but when you start expanding it you’ll get a much greater amount of storage in much less space than normal chests will take up.
The Enchantment System improves the enchantment table by allowing you to store enchantment books in it as well as lowering the cost of enchantments with skulls and giving you more points to spend with bookcases.