Make the items totally unbreakable with the same material as it is made is a bit over-powered. You should, when an item is renforced, add to it a second life bar. So when you reinforce it, it has 2 times more life, but not totally unbreakable. And add 1 item, the rarest you can, that can make any item really unbreakable. It would be better for the gameplay. Else, nothing to tell you, nice mod, great idea.