Goodies Conception with OpenSCAD and 3D printing of the battery cover - congrats to Zipang from Silicium forum
 OpenSCAD Code cube([52,32,2],center=true);
translate([-26,1,1]) {cube([3,4.5,2],center=true);}
translate([26,16,-1]) {
rotate([90,0,0]){
linear_extrude(32){
polygon(points=[[0,0],[2,4],[0,4]]);
}}}
translate([23.5,-15,1.5]) {cube([5,2,1],center=true);}
translate([23.5,15,1.5]) {cube([5,2,1],center=true);}
translate([22.5,15,2.5]) {cube([8,2,1],center=true);}
translate([22.5,-15,2.5]) {cube([8,2,1],center=true);}