shape profile, that I want to linear extrude and chamfer the upper and outer edges

scad

module outerShape(){
    hull(){
        translate([7.5,7.5]) circle(r=7.5);
        translate([7.5,55-7.5]) circle(r=7.5);

        midCircle=15;
        translate([45-midCircle,0]){
                translate([midCircle,midCircle]) circle(r=midCircle);
                translate([midCircle,55-midCircle]) circle(r=midCircle);
        }

        translate([60, 55/2]) circle(r=18);
    }
}





module throughHole(){
    center=[60, 55/2];

    translate(center)
        intersection(){
            circle(d=24.8);

            square([21,100], center=true);
    }        
}



difference(){
    outerShape();
    throughHole();
}