Create derived class for base class with private constructor

PrivateBaseClassConstructorInheritance.cs

using System;
using System.Runtime.InteropServices;

class Program
{
    public class Base
    {
        private Base()
        {
        }

        public int Value;

        public void HelloWorld()
        {
            Console.WriteLine("Hello world!");
        }
    }

    public class DerivedClassEmulator
    {
        private const int MaxInstanceSize = 1024;

        public byte[] Buffer = new byte[MaxInstanceSize];

        public void HelloWorld()
        {
        }
    }

    public class Derived : Base
    {
        private Derived(int n)
            : this(n.ToString())
        { }

        private Derived(string s)
            : this(42)
        { }

        public int Value2;
    }

    public static class DerivedCreator
    {
        [StructLayout(LayoutKind.Explicit)]
        public struct HelpStruct
        {
            [FieldOffset(0)]
            public DerivedClassEmulator Emulator;

            [FieldOffset(0)]
            public Derived Derived;
        }

        public static Derived Create()
        {
            return new HelpStruct { Emulator = new DerivedClassEmulator() }.Derived;
        }
    }

    static void Main()
    {
        Derived d = DerivedCreator.Create();
        d.Value = 1;
        d.Value2 = 2;
        Console.WriteLine(d.Value); // 1
        Console.WriteLine(d.Value2); // 2
        d.HelloWorld(); // Hello world!
        Base b = d;
        Console.WriteLine(b.Value); // 1
        b.HelloWorld(); // Hello world!
    }
}