disclaimer, I'm a lifetimer so I'm not a 100% this is avaliable to silver players but i believe it is: (upper body): select mechanical. left side, select chest & arms (very first selection, don't select attachment arms) right side, first popup selection: costume piece you sould see the options: tight for robotic arm left…
One thing I would love to see is a second mouth category. Many of the mouth pieces could yield some interresting combinations and it has long been a dream of mine to use the Steampunk Mustaches with some of the other beards.