screw_post_lower_y_offset  = (keyboard_y_offset - 2 * wall_width) / 2 + wall_width;
screw_post_middle_y_offset = screw_post_lower_y_offset  + 65.00;
screw_post_upper_y_offset  = screw_post_middle_y_offset + 65.00;
screw_post_x_offset        = (keyboard_x_offset - 2 * wall_width) / 2 + wall_width;

screw_posts_top_case = [
    /* Upper row */
    [screw_post_x_offset,   screw_post_upper_y_offset, screw_post_corner_height],
    [case_width_bottom / 2, case_length_bottom - 10.0, screw_post_middle_height],
    [case_width_bottom - screw_post_x_offset, screw_post_upper_y_offset, screw_post_corner_height],

    /* Middle row */
    [screw_post_x_offset, screw_post_middle_y_offset, screw_post_corner_height],
    [case_width_bottom - screw_post_x_offset, screw_post_middle_y_offset, screw_post_corner_height],

    /* Bottom row */
    [screw_post_x_offset, screw_post_lower_y_offset, screw_post_corner_height],
    [case_width_bottom / 2, screw_post_lower_y_offset, screw_post_corner_height],
    [case_width_bottom - screw_post_x_offset, screw_post_lower_y_offset, screw_post_corner_height]
];