Take the roof supports as shown above.
Glue them into place so that they extend through the
wall (see pic).
Glue the door into position.
Take the main roof and door section.
Glue them together as shown.
Add the end support.
Then place this onto the lower half of the building.
Take the other three walls.
And glue them into position.
Note: Do
NOT
glue them to the lower half of the
building if you wish to be able to remove the main
roof section.
Take the remaining roof supports and door.