I last saw NBS at the 2007 nationals or perhaps the Carnac straight after that. Looked fundamentally very good. The boat is v well equipped and if down to weight could be as fast as any of the Atum/Subtle period boats.
She has a simpler construction than Atum, with single fat wingbeams going out to relatively low wings. The floor is thicker than Atum and the deck flatter. IIRC the bottom was not too well faired.
1) Thicker floor than Atum: Atum had a thin floor to assist with recovery from a capsize, but it means carrying more spray around. Riot Van had a thick floor and a bit of technique is required to recover from a capsize. All boats now have thicker floors I think. Atum's was 80mm at the back and 280mm at the case IIRC. Antidotes was 340mm at the case and 170mm at the back, which is probably about what NBS has. This makes tacks quicker ergonomically.
2) The fat wingbeams might be a bit bendier than the triangulated system on Atum and Antidote, but lots of boats do well with this system.
3) The shrouds are dyneema and thin. They probably could do with replacing with either fatter dyneema or wire.
4) The mast I think is a c tech. Really good and not overly used.
5) The bottom is bumpy and just needed to be faired. might have been done since.
I can't recall anything about the foils or sails, but it had excellent progrip art. This is a boat which needs a loving home. Ghislain now lives in the US, so I dont know how it can be collected but I guess it will be in the basement of his place in Paris.
I am in touch with him if you are interested. I think the boat comes with a good trailer as well.