It’s basically a combination of the video from the Italian Blu-ray (which IMHO looks slightly better than the German Blu-ray in terms of picture quality from what I’ve read) and the opening and closing titles and mono track of the Kino Lorber Blu-ray—in other words, basically a definitive edition for the Anglosphere.
As for colors, I’m tentatively planning to use the letterboxed MGM/UA laserdisc as a color reference of sorts, in order to produce a quality transfer which further improves on the Italian Blu-ray and goes miles past the MGM and Kino Lorber Blu-rays (ESPECIALLY the former, which strays farther from director Sergio Leone’s intentions, let alone what videophiles expect from a good old low-budget Italowestern, than even the excessively yellow-looking Kino Lorber Blu-ray). I might even produce a 10-bit HDR version, depending on the capabilities of the current freeware programs. If things go well enough, and the freeware becomes capable enough, eventually I’ll even do a 4K UHD ISO using said 10-bit HDR version.
But for now, I’ll stick with bog-standard 8-bit SDR HD, and do the best I can manage with that.