ok here is a list I have thought of over the past 3 days of different things you could add
1. Enemy mobs and the ability to fight them.
2. Inventory slots and different tools.
3. For making handles use the wood that's in the back of the shop and chop it with an axe (more tools like the one above)
4. To make it more realistic add nuts and bolts and sprockets to hold the weapons together
5. bows and arrows.
6. a small mine shaft too get the super rare ores and ingots but you have to unlock it
that's all that I have for tonight I think It would be awesome :D
let me know what you think dasius :)