Hi Brian,
Simply put, animated doors no longer work because they were broken when P3D came along. When we did the extensive object conversions in order to make our libraries FSX/FSXDX10/P3D cross platform compatible, the animated hangars couldn't be made to work in P3D, so they were removed. A new readme file for the SAK Seaplane Bases v 2_1 will reflect the mistakes that you and others recently caught. Doug will upload the new Sak Seaplane Bases package reflecting that change when he has time.
As an aside, I strongly recommend that you install not only the Part I, Part II, and Part lll libraries, but also the RTMM Medical and APP Libraries FSXP3D and the RTMM BWEP (Blue Wave Energy Partners) Library as well. Without all of these libraries installed you will be missing numerous objects in some of the scenery.
Steve