And, lately as I start programming, I've been working out the particulars. Here's what I've got so far:
Mined with a Stone pick, about as common as Iron. Drops one Protodermis ore, which looks similar to the MNOLG interpretation.
Crafting the ore with a bucket will give you a bucket of Liquid Protodermis, which can be placed for the fun of it, and won't have much use in the modification. It will be a silvery-blue liquid.
Stone and Protodermis can be crafted into a Maskmaker's furnace (probably temporary, but will come back if I ever decide to do a Metru-Nui version of the modification.)
Can also be crafted into Protodermis Tools (which should look like MNOLG tools too. )
Probably temporary, as described above.
The GUI Includes a 3x3 Crafting slot, a smelting fuel slot (or fuel will be placed in the crafting grid), and a result slot.
Put Protodermis into the crafting and some fuel, and it will smelt into Protodermis, Purity 1. Put that in with fuel, and it will smelt to Purity 2, and so on.
Place an elemental shard surrounded by four Protodermis Purity 1+ (like a compass), and it will give you a Disk from that Metru, which can be launched with a Protodermis Disk Launcher, that also has the power level of the average Protodermis Purity level put in, and a random effect.
Place the correct types of disks (like in this chart), and it will yield the correct power and type of Kanohi. (Up to powerless, for now!)
Also a temporary feature, I might not even make them shoot, but basically, they will be used to make your masks.
Craft a Disk Launcher with 4 Protodermis in a Y shape to fire. (maybe)
The principal defense of the Matoran of Mata Nui. It can be crafted with four Sugarcane around a wood block. Thrown with the hand, and it does 2 damage. If it hits a block, it should drop the item.
For now, only powerless Kanohi will be attainable, but they can be dyed into any color you can get with Minecraft Dyes. Once the Quest for the Masks update is up, you can obtain powered masks through searching. Powerless masks will also be obtained from dead Matoran (whose friends will not like you if you were their killer). Infected Masks will probably be a drop of Tarakava, Muaka, and Kane-Ra, which will give powers, but damage you each time they are used.
Future drop of either Bohrok, Rahi, or Rahkshi, they will be used to craft Toa Armor and Tools. For now, I'll add crafting recipes as described above.\
Toa Armor and Tools
Armor is crafted with the same orientation as regular Minecraft armors, but out of the respective Shard. Maybe I'll make them able to be dyed.
Tools are crafted in the shape of the correct tool with sticks as handles and Shards as the blade. I'll think about how to make the recipes fair.
Both will have to be enchanted before they gain elemental powers. Once you wear all the armor of a specific element, they will grant you elemental energies and powers, although a much smaller elemental energy bar than if you have a Great Mask. The Toa Tools will each have powers related to their element.
About the same spawn rate as Redstone, when mined with a Protodermis pick (and only a Protodermis pick), it will give 1-3 Lightstone. Lightstones have a similar model to torches, and can be placed on nearly any surface, even on ceilings.
I'm still considering this one, I have two ideas for it. For both, it has the same spawn rate as maybe like Gold. Trust me, it should be worth it.
1. When the ore is mined with a Protodermis Pick, it will leave a crystal in the wall. Click on it with a Heatstone Container (see below, sans Depleted Heatstone) in your hand, and you can pick it up, considering they were too hot to pick up.
2. When you break the ore, it will drop one Depleted Heatstone. Take it back to your home, and craft a Heatstone Container, 7 Protodermis in a U-shape with the Depleted Heatstone in the center, and smelt it. The heatstone will become active.
It can now instantly melt any cold block or function as a Flint and Steel for 15 uses, but it turns depleted at the end, and can be smelted to rekindle it. Eventually, it should run out.
So, how's that sound for a first update?