6. According to the drawing below, glue part 13 around forecastle frame - like with the hull keep the top edge of  wall 13 aligned with the edge of  forecastle deck 12. At some points part 13 extends higher than deck 12 - be sure to keep this extension equal along the edges of part 12.

 7. Before you proceed to the next step it is neccesary to install all small guns 67 which are placed on deck 12. You won't have access to this area later. Use thin wire to create 6mm long gun barrels for those guns.
 The picture below shows an actual model at this stage of construction.