Hi,
Although I would run out to be the first person in Delaware to own a "Buk's Doodles" book, I can imagine that this would not sell enough copies (outside of this list, of course), to justify their release.
I'm not a betting man, but I would almost bet the farm (If I had a farm) that this will never happen from Ecco. Of course, maybe one day some benefactor will promise them a hefty royalty advance and they will let it happen, but HarperCollins will probably not touch this project.
All best,
Bill