Firstly, around here we understand a "preservation" to mean a capture of a laserdisc, VHS or TV broadcast.
The type of project you are talking about - tweaking an official DVD to make it anamorphic, or add a commentary track - we call a "custom DVD".
I imagine that many people have made their own anamorphic DVDs from the OT "bonus" discs. For example, I made my own version of ANH which included the mono mix and original Dolby mix as alternative soundtracks. This was in 2007, before g-force had come up with the image stabilization script.
Sometimes these "Custom DVDs" get shared (released, uploaded, distributed, etc.), but unlike preservations or fan edits we don't allow discussion regarding how or where to obtain such discs.
If you want to make your own custom DVD using the image stabilization script, and add an audio commentary, there's plenty of help available in the technical help forum.