Saga 35 http://www.sailboatdata.com/viewrecord.asp?class_id=3030 Ballast of 7800lb doesn't seem right on a boat of 12,810. 7800 ballast is the same as the Saga 43.
Saga 43 and 48 are listed as sloops which seems accurate in one sense since only one headsail ever flys, but seems inadequate since the both have two headstays, 1 to bow and 1 to sprit. Perhaps a classification of "solent stay sloop' would be more descriptive. I understand that doing so might be more work than it's worth and confusing to newbies but I did want to bring up the idea.
Adding a new rig category wouldn't be hard.
I wouldn't call these boat cutters though. I don't believe the J measurement for these boats by the designer includes the bowsprit.
The sail area that I list would be more accurately described as 'upwind' sail area.
I J P E measured as triangles (a convention used my most rating rules.)
I also have SPL and ISP for boats that fly non standard off wind sails.
The base of the fore triangle extending to the bowsprit on the Sagas may technically be called SPL. But no calculations are made from those numbers. There are so many variables as to how asymetrical spinnakers/gennekers, etc. are measured from one boat to another that a coinsistent formula would be less than meaningful. If a downwind sail area is available, I just add it to the notes.
I do actually have a diagram on the site that attempts to explain these numbers.
I'm also in the process of putting together some rig type and hull type diagrams.