Sure it sounds cool, and like it could lead to some interesting gameplay and crafting mechanics. Then you realize, there will be how many different materials? 100? 200? More? Even assuming a best case scenario where every materiel can stack infinitely in inventory (currently many don't stack at all!), that means any dedicated crafter is going to have hundreds of thousands of items in their inventory. I'll be honest CIG, neither your inventory system nor your database system can handle that. If stack sizes are not infinite, then crafters are going to have literal millions of different items in their inventory to have to wade through to try and do their job. The server will crash every time a crafter opens their inventory. Give us at most 10 different levels of quality, and make sure stack sizes in local inventory are infinite for every resource. Please.