I learned about Philippe's Naja from a Forum discussion. The only information I have is that Philippe built his Naja from 1980 to 1982. Here is the picture he sent me.
A beautiful Naja owned by David Whittock. Here is what David wrote when he sent the pictures:
Hi Roger,
Here are the pictures of my boat taken in Holland. One was taken by myself while waiting for the lock to open, the other two while moored in Veere which is a small town situated at the Veeres Meer end of the Walcheren Canal. I hope this will give you details of the boat. The person in the boat is my friend Brian who usually sails with me as my wife does not like sailing and chooses other places for her holidays. We hope to be going to Holland again this year and try further north maybe as far as the German border.