All the struts are in place!!!!!! To be basically simple, this was a booger to build.
The v-strut under the engine and the bracing struts between the rudder and elevator are not included, so don't waste your time looking for them! They are not hard to make, so no problem.
Google "Sikorsky S-39" before starting and really spend some time figuring out the strut configuration, especially where they attach to the fuselage. Look at (and print) lots and lots of photos. One good source of pix is http://www.safarimuseum.com/
. By the way, the width at the top of the fuselage-to-wing N-struts is the distance between the tail booms.
You will find your ulcers are less likely to flair up if you use Duco or Testors Glue for Wood Models (or something similar) to stick the booms in place --- with white glue, you are doomed to weeks of holding struts in place until the glue dries.
Study the tail booms for the S-38
and modify those on the S-39 the same way.
Above all don't get in a rush!!!!!