I realize that this thread is dead or dying, but I just returned from a trip to Italy. When there, I saw a Nissan Navara pickup truck with a hard bed cap on it that looked unbelievable to the one that bondo made for the F150. It looked like this.
In all, I saw 3 of the pickups and all had the bed cap on it. There is a cap like the one shown that is available through Nissan that cost € 2.614,80!!!!! But there are other makers of the hard caps like the one above that look the same. Do a google images search on Nissan Navara Hard Top and you will see all the suppliers of the cap.