Javascript Nested Classes

Are there any potential issues with the following Javascript code:

var BobsGarage = BobsGarage || {}; // namespace

/**
 * BobsGarage.Car
 * @constructor
 * @returns {BobsGarage.Car}
 */
BobsGarage.Car = function() {

    /**
     * Engine
     * @constructor
     * @returns {Engine}
     */
    var Engine = function() {
        // definition of an engine
    };

    Engine.prototype.constructor = Engine;
    Engine.prototype.start = function() {
        console.log('start engine');
    };

    /**
     * Tank
     * @constructor
     * @returns {Tank}
     */
    var Tank = function() {
        // definition of a tank
    };

    Tank.prototype.constructor = Tank;
    Tank.prototype.fill = function() {
        console.log('fill tank');
    };

    this.engine = new Engine();
    this.tank = new Tank();
};

BobsGarage.Car.prototype.constructor = BobsGarage.Car;

/**
 * BobsGarage.Ferrari
 * Derived from BobsGarage.Car
 * @constructor
 * @returns {BobsGarage.Ferrari}
 */
BobsGarage.Ferrari = function() {
    BobsGarage.Car.call(this);
};
BobsGarage.Ferrari.prototype = Object.create(BobsGarage.Car.prototype);
BobsGarage.Ferrari.prototype.constructor = BobsGarage.Ferrari;
BobsGarage.Ferrari.prototype.speedUp = function() {
    console.log('speed up');
};

// Test it on the road

var car = new BobsGarage.Car();
car.tank.fill();
car.engine.start();

var ferrari = new BobsGarage.Ferrari();
ferrari.tank.fill();
ferrari.engine.start();
ferrari.speedUp();

// var engine = new Engine(); // ReferenceError

console.log(ferrari);

The goal is to have prototype inheritance and nested classes so that classes defined within BobsGarage.Car are not accessible outside the constructor of BobsGarage.Car but instances of them are accessible to derived classes, as shown in the test code.

Note: I am referring to the concept of Class in Javascript as defined on the MDN.