It really Depends on what Materials you have and Depends even More what you want him to be able to do
You Cant Use diamonds anyway i think
Best would be to get some steel
Smelt It down do a pickaxe then make a Trip to the nether and mine Cobalt (you need steel to be able to mine Cobalt though) if you want faster mining but Bit less durability Stick with Cobalt for Hammer head if you want More durability for a Bit less mining speed combine the Cobalt with Ardite (also found in the nether yellow Ore) in a smeltery to get Manyullyn and from There on It Depends
You want even More durability Take obsidian for the plates
If you want modifiers go with thaumium plates
And tough rod i'd Suggest Manyullyn since It Has the highest durability modifier
If you want to charge It with rf Dont waste your Manyullyn on the rod and Take electrum
Best would be to just Check that out
http://tinkers-construct.wikia.com/wiki/Material_Stats
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