$fn=100;
thickness = 5;
x = 250;
y = 190;
z = 120;
rim_breadth = 30;
drain_d = 34;
scale_center_crosspiece = 0.15;

difference () {
difference () {
  union() {
    // Base bowl
    difference() {
      cube([x, y, z], center=true);
      translate([0, thickness/2+0.01, thickness/2+0.01])
      cube([x-2*thickness, y-thickness, z-thickness], center=true);
    }
    // Center crosspiece
    translate([0, 0, -z/2 + thickness + scale_center_crosspiece*z/2])
    cube([2*thickness, y, scale_center_crosspiece*z], center=true);
    // Rim back end
    /*translate([0, -y/2 - rim_breadth/2, z/2-thickness/2])
    cube([x, rim_breadth, thickness], center=true);*/
    // Rim sides
    /*for (v=[-1:2:1]) {
      translate([v*(x + rim_breadth)/2, -rim_breadth/2, z/2-thickness/2])
      cube([rim_breadth, y + rim_breadth, thickness], center=true);
    }*/
    // Front end dam
    scale_dam = 0.4;
    translate([0, y/2 - thickness/2, -z/2 + (scale_dam*z)/2])
    cube([x, thickness, scale_dam*z], center=true);
  }
  // Drain
  union() {
    scale_drain_gland = 1.4;
    cylinder(r=drain_d/2, h=2*z ,center=true);
    translate([0, 0, -z/2+(scale_center_crosspiece*z)/2+thickness])
    cylinder(r=scale_drain_gland*(drain_d/2), h=scale_center_crosspiece*z+thickness,center=true);
  }
}
translate([-x/4 - rim_breadth/2, 0, 0])
cube([x/2+rim_breadth+0.01, 2*y, 2*z], center=true);
}