Armor?
Having made many elbow and knee cops using only a stump and a wooden mallet, the sound is much less... Depending on the stock used, your machinest tools would make more noise.... When it get to the rivet stage, some of the critical joints were steel, but the straps were held on with Tandy 2 piece rivets.... almost silent...
Much of this was done outside (and occasionally inside) barracks around the world.... ;-)
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