a question about the best way to do something

[Mightydanp]

Hello I have a big question on how to do something. My question is that I have a item that has a gui. The gui has 3 slots. The item is a tool that you can change the items out. When you change out the items the items save data to nbt. such as mining speed, durability, enchants, color of the layer of that item. What would be the best way to implement this? Would I have problems  setting the value of the tool after changing out the part? Would there be texture issues because changed the color of the tool? if so isn't there a way to refresh the items texture?

For an example of a tool I have a axe. The axe has 3 parts. The axe head, wedge, and the handle. Say the tool has a wooden handle and a wooden wedge. The pickaxe head is stone. The pickaxe head sets the color and the mining speed of the tool. Each part has its own durability of its own and gets damaged over time. When I switch out the pickaxe head with a Bronze pickaxe head it changes the color of that items layer and the mining speed and saves those values into nbt to use for later on if needed.

What is the best way to go about this and what will me problems be?