The cockpit section is an integral structural part of the fuselage and must be done at this point.
here is the framed section and the inner wall.
The cockpit itself is simple and unless you plan an open canopy, it will do fine.
The designer did add a very helpful feature to align the inner wall to the cockpit, by having positioning homes on the frame ( part 8A ) and the inner wall.
insert a straightened paper clip to act as an alignment pin.
slip in the wall
glue in place using the pin alignment. When dry, remove the pin.
glue the outer skin lightly around the canopy opening.
now the nose section is attached to the center section.
Isaac