Paint your wire strips black...or if you can find black wires (like pipe cleaners) that too is fine. Place it on the sails at the top and bottom and hot glue it....it would adhere better if the surface has a bit of varnish on them..so make sure to vanish the back too in the previous step.
put a bit of UHU glue or hot glue to the top of the mast and wrap the flag tightly around the mast. Next attach the boat. Finally attach the sails.
Place the waves on the floor and place your boats on it....You may follow the picture or place it anyway your heart desires :-)
Take a snap shot so you wont forget how it's placed.
Now remove the boats and slowly attach the back boats first to the waves with the black wire( twist it well)...attach where it's covered by the sails.
Pull the waves up a bit when you are attaching the front boats so it would be higher.
Step back...look and tweak the waves hear and there to give a better dimension.