when you go into build mode, you will see a big arrow pointing to the front near the core, if you forget halfway through you can look in the top-middle of your screen there is a small one pointing to the same direction.
if you completely build a ship, and you want to turn it around there is a tool its called the \"offline ship viewer\" and there are some plug-ins(included) that allow you to turn and edit the core/ship and using that you can turn it around so that you can have normal ship. you might wanna search for a tuturial intalling it.
http://star-made.org/content/offline-ship-editor
them site of it^
i\'d recomend not forgetting wich way it faces, but if your booboo is to big this your option... hope this helps