Grate for zenith space command controller

grate.scad

SPACING = 1.5;
W = 25;
H = 100;

module grate(W, H, SPACING) {
    for (i = [0:W/SPACING/2]) {
        translate([(SPACING * 2 * i) - ((W-SPACING)/2), 0, 0])
        square([SPACING, H], center=true);
    }
}

module assembly() {
    grate(W, H, SPACING);
    difference() {
        square([W, H], center=true);
        rotate(90-45)
        grate(H, W*3.14, SPACING);
    }
}


module shape(angle) {
    polygon([
        [0, H/2],
        [W/2, H/2*cos(angle)],
        [W/2, -H/2*cos(angle)],
        [0, -H/2],
        [-W/2, -H/2*cos(angle)],
        [-W/2, H/2*cos(angle)],
    ]);
}

color("black")
linear_extrude(2)
difference() {
    assembly();
    difference() {
        square([W*2, H*2], center=true);
        shape(30);
    }
    
}