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Copper is a metal and deserves the same treatment Iron gets in the game.

Copper Trapdoors -

Copper Pressure Plate

Copper Railing (like Iron Bars) -

Copper Doors -

Copper Plated Chains (Skip the copper nuggets and just use an ingot with a normal chain to craft it) -

Mojang can even get a little creative and use the hopper style recipe to make copper tubing/pipes. I'd also like copper Signs