Good on you glider!!
I would go to the shop manuals to bring back the bike as close to original as it can be. I know that there are special little bits that collectors know about that will make an original bike original. The bigger market for that are the Indians and old Harley baggers. For example experienced collectors know that at the back of a Harley Electra glide or Duo-glide gas tank there is a imperfection that came from the factory. When the owners say original paint if you look for the imperfection and it is not there it has been repainted. I don't think that there are any books about what your looking for about Sportsters. Maybe you can be the first to write it.
Good luck and keep us up to date on how your doing.