$fn = 32;

$space = 5;
$width = 15.2;
$length = $width;
$height = 0.4;
$holes = $height*4;

$columns = 6;
$rows = 5;

module pin(){
    cylinder(h=$holes, r=1, center=false);
}

module switch(){
    $xCenter = $width/2;
    $yCenter = $length/2;
    translate([$xCenter, $yCenter, 0])
        cylinder(h=$holes, r=2.522, center=false);
    translate([$xCenter + 0, $yCenter + 5.9,0])
        pin();
    translate([$xCenter + 5, $yCenter + 3.8,0])
        pin();
    translate([$xCenter + -5, $yCenter + 3.8,0])
        pin();
    translate([$xCenter + -5, $yCenter + -5.15,0])
        pin();
    translate([$xCenter + 5, $yCenter+-5.15,0])
        pin();
 }

module switches(){
for (x=[0:$columns -1])
   for (y=[0:$rows-1])
      translate([x * ($width + $space/2) ,y * ($length+$space/2) ,0]) 
        switch();
}

module body(){
    $x = (($width + ($space/2)) * $columns) + $width;
    $y = (($length + ($space/2)) * $rows) + $width;
    cube([$x, $y, $height]);
}

difference(){
body();
translate([$space,$space,$holes/2*-1])
switches();
}