a 2D nebula map showing all the existing components' locations (Helix Nebula, Ring Nebula, etc) something like this.
an extra pack of 3D models for nebulae, supernovae, clusters
recreate the galaxy using density wave theory
This seems a bit far fetched, because density wave best works for 'classic' not custom galaxies such as the Milky Way. I say custom because the Orion Arm looks like a rogue arm between two spiral arms (and not connected to the core).
more nearby Galaxies and structures (Large Magellanic Cloud, etc)
Galaxy Map - upcoming features
Galaxy Map - General Info
It contains a 3D model of our Galaxy, the Milky Way with neighboring dwarf galaxies (such as Sagittarius and the Canis Major Overdensity) and stellar streams. Touching a structure of the galaxy will take you to the wiki page and show you some of its components (nebulae, star clusters, supernovae). Photos are taken by NASA spacecraft and ground based telescopes like Hubble Space Telescope, Chandra X-Ray, Herschel Space Observatory and the Spitzer Space Telescope.
Many of the components also have a 3D model generated from one of its 2D pictures.
Model of the Milky Way Galaxy
Helix Nebula in infrared
Orion Arm components