any hull is a basic fit out, Bart , whether a fishing boat, or destroyer, ocean liner, etc.
the main strength in the hull apart from it being grp in this case is the deck and the supporting cross beam members., all made from 6mm square or 9mm square section timbers which the deck will lie on.
its not rocket science, nor should it be foreboding, but very simple building.
if you look on almost any grp based build on here, including my lifeboat builds, and especially all those builds in the master class section, almost every model based on a GRP hull, the basics are all the same. and once you get your running gear in the boat, which is also explained in most builds and the deck on, then the upper build will just flow.
nothing to be frightened of as the Cygnet is a very easy build...….built one some years ago up to cabin level and then gave it to my brother in law for his son to play with.
just have a good read of build projects on here and you'll soon get the gist of what is needed for a build to start and progress.
neil.