Then, positioning the part in the fuselage, I constated I made a big mistake: the parts that comes above the fuselage must be placed early, at the time of assembly of the fuselage! I had to reopen the fuselage; to introduce that part and to glue the fuselage again...
To be said that many parts are not visible in "closed configuration", but are useful if you wish to build a Schuckert with all the panels open...
Take care also that the INTERIOR of the lower grid must be painted! I did not made that, but that will be visible as you can see. So, I painted with Rub 'n Buff...