The following models are manufactured by Billing Boats and have been graded by them as to difficulty in building.  Their levels are as follows:

  The Beginner - Choose this level if you
         have never tried model building before.  

  The Advanced Beginner - This level is for those who have built a model ship
        before, either out of wood or plastic.  They have simple construction, but will
        present some challenges. 

  The Experienced Builder - If you've already built a few models, this is your
         level.  Some of the more detailed work is left up to you.

  The Expert - The experienced modeler will find many challenges, and many
              hours of concentrated effort, with these large and impressive models.
              These sets require dexterity and a perfect technique.  You'll be on your own
              with a lot of the details in these models.