The v11a download link now works, thank you, but it may be the wrong file, as the 11a download files do not contain, or generate, a PlanetTextures and/or StarTextures folder. So unfortunately I still cannot test the planet/star depth issues easily.
OK, here is what I have found so far:
Elite 32 bit:
Will not now start, so cannot test! (Nothing to do with the 3D, of course!)
Elite 64 bit and Horizons 64 bit (using v11a):
/ toggle works fine in the System Map, but seems to have no effect in normal space, and I cannot detect any "pushing back" or other effects. (As I am not sure exactly what I am missing, this doesn't worry me, and makes me wonder about setting the toggle so that the default on boot is set to on for the system map. What do you think?)
The inside of space stations, both below and above launch pad, are rather dark, with some features not discernible. Also, the green and red exit lights shine too far in front of their location, as do the red lights of what I will call the three Rama horns at the rear of a station, and the red/orange lights outside a station. This latter is particularly noticeable.
In space, the stars are too close, and very obviously in a "plane" (in front of the milky way and nebula). I do not recall this being an issue with the 32 bit version, but cannot now check as the upgraded version will not boot! I will try using the nebula tweak to adjust this.
Everything else seems fine in the 64 bit version
Hope this helps. Keep up the good work!
Will keep trying and post updates as I use and learn more.