part="left";
part_w=132.3; part_h=132.0; thickness=1.8;
y_bottom=6.5; y_top=125.5;
rack_x_from_outer=8.7376; rack_slot_l=11.0; rack_slot_h=7.0;
monitor_hole_d=4.5; monitor_x_left=123.3;
key_x_left=65.0; key_w=16.0; key_h=22.0;
key_y=[30.5,66.0,101.5];
module pill2d(length,height) { hull() {
 translate([-(length-height)/2,0]) circle(d=height,$fn=96);
 translate([ +(length-height)/2,0]) circle(d=height,$fn=96);
} }
module wing(left=true) {
 rx=left ? rack_x_from_outer : part_w-rack_x_from_outer;
 mx=left ? monitor_x_left : part_w-monitor_x_left;
 kx=left ? key_x_left : part_w-key_x_left;
 linear_extrude(height=thickness) difference() {
  square([part_w,part_h]);
  for(y=[y_bottom,y_top]) translate([rx,y]) pill2d(rack_slot_l,rack_slot_h);
  for(y=[y_bottom,y_top]) translate([mx,y]) circle(d=monitor_hole_d,$fn=96);
  for(y=key_y) translate([kx-key_w/2,y-key_h/2]) square([key_w,key_h]);
 }
}
wing(part=="left");