I did a little more research and found this French language site that talks in detail on this projects:
http://aviateurs.e-monsite.com/pages...r-trident.html
There is a photo showing the aircraft from the rear. The flaps are split on the bottom only which is not what I like to model, so at this point, I don't think I will drop the flaps on my model.
here are the pics from the web:
Isaac