public class Point
{
    public Point(int x, int y)
    {
        this.X = x;
        this.Y = y;
    }

    public int X { get; private set; }
    public int Y { get; private set; }
}

public class Rectangle
{
    public Rectangle(Point begin, Point end)
    {
         this.Begin = begin;
         this.End = end;
    }

    public Point Begin { get; private set; }
    public Point End { get; private set; }
}

var generator = new Generator()
var result = generator.GenerateType(typeof(Rectangle));

dynamic instance = Activator.CreateInstance(result.Type);

public class Point
{
    private int x;
    private int y;

    public Point()
    {
    }

    public Point(int x, int y)
    {
        this.x = x;
        this.y = y;
    }

    public int X
    {
        get { return x; }
        set { this.x = value; }
    }

    public int Y
    {
        get { return y; }
        set { this.y = value; }
    }
}

var pointTypeDescription = new TypeDescription("Point", new List<IPropertyDescription>()
        {
            new PropertyDescription("X", typeof(int)),
            new PropertyDescription("Y", typeof(int))
        });
        
var generator = new Generator()
var result = generator.GenerateType(pointTypeDescription);

dynamic instance = Activator.CreateInstance(result.Type);