Right now, the ATM star requires thousands of iron and gold ingots but very little of any other metals. I would like to see other metals such as bronze incorporated. This could be done by changing the tier 2 opinium core's iron blocks to bronze blocks. The same could be done with the other repeated vanilla metals. It would make the recipes a little more interesting.

Are you insane?!? Don't give the dev ideas! He'll make it so we have to kill Herobrine himself to create the opinium cores! Wait... did I just say that? Crapbaskets....

For now, the recipes are what they are.

However, it is a great idea and one we will look in to in upcoming packs.