The plastic weight is glued in place but to assure the position of the plane on his landing gear I add some lead weight on the nose.
The fuselage can now be closed and the fit is revealing very good, the ailerons are glued also at this stage and so is the nose and the air intake.
The wings
A little surgery is needed to separate all the landing gear doors and airbrake which is moulded is one piece so with a modelling knife and care gently cut all these parts as you can see on the picture.