height=148;
width=80;
thickness=2;
difference() {
    cube([height,width,thickness]);
    
    // corner cutouts
    corner_radius=9;
    translate([0,0,-0.5]) {
        cylinder(thickness+1, corner_radius, corner_radius);
    }
    translate([0,width,-0.5]) {
        cylinder(thickness+1, corner_radius, corner_radius);
    }
    translate([height,0,-0.5]) {
        cylinder(thickness+1, corner_radius, corner_radius);
    }
    translate([height,width,-0.5]) {
        cylinder(thickness+1, corner_radius, corner_radius);
    }
    
    // mounting holes
    mounting_hole_radius=1.25;
    x_distance=18;
    y_distance=3.5;
    translate([y_distance,x_distance,-0.5]) {
        cylinder(thickness+1, mounting_hole_radius, mounting_hole_radius);
    }
    translate([y_distance,width-x_distance,-0.5]) {
        cylinder(thickness+1, mounting_hole_radius, mounting_hole_radius);
    }
    translate([height-y_distance,x_distance,-0.5]) {
        cylinder(thickness+1, mounting_hole_radius, mounting_hole_radius);
    }
    translate([height-y_distance,width-x_distance,-0.5]) {
        cylinder(thickness+1, mounting_hole_radius, mounting_hole_radius);
    }
    
    // battery mounting holes
    battery_mounting_hole_radius=1.25;
    for(i=[1:3]) {
        translate([i*37.5-9,28,-0.5]) {
            cylinder(thickness+1, battery_mounting_hole_radius, battery_mounting_hole_radius);
        }
        translate([i*37.5-9,width-28,-0.5]) {
            cylinder(thickness+1, battery_mounting_hole_radius, battery_mounting_hole_radius);
        }
    }
    
    // xiao mounting point
    xiao_pin_header_distance=15;
    xiao_pin_header_length=17;
    y_offset=10;
    cable_tie_slot_length=6;
    translate([height-9.5-xiao_pin_header_distance,y_offset,-0.5]) {
        cube([1.5, xiao_pin_header_length, thickness+1]);
    }
    translate([height-9.5,y_offset,-0.5]) {
       cube([1.5, xiao_pin_header_length, thickness+1]);
       translate([-cable_tie_slot_length/2+1.5/2-xiao_pin_header_distance/2,-5,0]) {
          cube([cable_tie_slot_length, 2, thickness+1]);
       }
       translate([-cable_tie_slot_length/2+1.5/2-xiao_pin_header_distance/2,xiao_pin_header_length+3,0]) {
          cube([cable_tie_slot_length, 2, thickness+1]);
       }
    }
    
    // sensor module mounting holes
    sensor_module_mounting_hole_radius=1.25;
    sensor_mount_distance=8;
    for(i=[1:3]) {
        translate([height-i*sensor_mount_distance-2,width-12,-0.5]) {
            cylinder(thickness+1, sensor_module_mounting_hole_radius, sensor_module_mounting_hole_radius);
        }
        translate([height-i*sensor_mount_distance-2,width-30,-0.5]) {
            cylinder(thickness+1, sensor_module_mounting_hole_radius, sensor_module_mounting_hole_radius);
        }
    }
    
    // air valve cutout
    air_valve_cutout_width=10;
    translate([-0.5,width/2-air_valve_cutout_width/2,-0.5]) {
        cube([8+0.5, air_valve_cutout_width, thickness+1]);
    }
}

$fn=70;