Azzanine has a point. We don't really need another metallurgy, but it is cool that you are making a mod
If I were you, I would start off with small mods then work your way up to bigger ones like the one you have planned. Take LMT for example. I originally went into it, not knowing Java all that well, big ambitions, and without any direction. It's really overwhelming for me. If it wasn't for Zandorum, my mod would just be an overpowered mess, with just lacklustre items and a billion different tools and pick axes, that all sort of do the same thing (Like the gem tools before I removed them
). If you really have your heart set on a project like this, get someone to help you, whether it just be some ideas, coding, modelling, textures, or even balancing