The main obstacle is however not the techniques involved in designing the NMBR system, but in getting it accepted and getting RC's to use it.
I feel that is one of the snags we hit back in 2004 and 2005.
Texel used two ratings for a while, one for big wind and one for light winds, but the RC's overhere simply refused to use this version. The only solution to the mutany of the rc's was to drop the double ratings again even though that was an important feature in getting the singlehander ratings like the A-cat right.
The fist made by the sailors was insuffient (well it was probably non-existant) to force RC's to use the improved ratings. This is one reason why some to the drawbacks of Texel still exist, not because it isn't technically possible or even practical but simply because some important group of people simply refused to cooperate.
File this under lessons learned.
Wouter