length = 116.0;
width = 10;
height = 20;

peg_width = 2;
how_many_pegs = 16.0;
peg_height = 12;

p_dist = (length-peg_width)/how_many_pegs;

include <BOSL2/std.scad>

difference(){
  cube([length, width, height]);
  for ( i = [0:how_many_pegs] ) {
    translate([i*p_dist + peg_width, -4, height - peg_height])
    translate([(p_dist-peg_width)/2, (width+8)/2, (peg_height + 5)/2])
      cuboid([p_dist-peg_width, width + 8, peg_height + 5], rounding=2.5);
  }
}

echo((length-peg_width)/how_many_pegs);
echo((length-peg_width)/how_many_pegs - peg_width);