Nicely done! Is there any chance for a lossless version?
It's actually rather tedious to remove all of the extra bits in the BR multitrack and patching things up that are spread all over the place, not to mention keeping track of volume levels and other details. I know this because I did something similar very recently (only that I kept the extra stuff), so thank you for this.
By the way, there's a fan mix section if you wish to post more of your own work, which is the actual place for these things. But the mods don't care much about that anymore.
Lossless means no quality loss. Lossy formats cut out certain frequencies to make the file much smaller, but the quality loss is irrepairable.
Formats like FLAC are identical to WAV in quality, but are just made smaller for more convenient file sharing. They can go back and forth between FLAC and WAV an infinite number of times without quality loss.