Man, you're doing a helluva job on that.
Okay, let's see. Muhoumatsu no Isshou. I've got that as running three issues of Weekly Jump, and that's… basically all I know at the moment. That's probably not even enough material for it to have been collected. I'm wondering if it's an adaptation of Rickshaw Man? And checking wikipedia... I'm right!
Akagami no Ookami, though... There's this http://asunahiroshi.xrea.jp/biblio/book21.html that appears to have the same title, so maybe there's a connection there.
Interesting thing about Murata's Hetappi manga lab R is that it's a sequel to Toriyama's old Hetappi manga lab. So you've got two different guides by two masters of the art form. Love it. Surprised no-one's touched it, moreso since he used it as a building block for his papercraft experiments that blew up the internet a while back.
And finally Kujira Daigo. Was he really that big? Yeah
http://www.mandarake.co.jp/information/2009/07/27/21nkn08/p1.jpg
http://ameblo.jp/books01/image-10434751057-10376651143.html
http://ameblo.jp/books01/image-10434751057-10376651140.html
As for why it only lasted two volumes? Short series were pretty par for the course for Weekly Shonen Jump until the last two decades, where they started going out of style big time. I think a lot of it was authors taking up the chance to appear in this new replacement for Shonen Book, committing for short-term creations just to help get it going, at least in the first few years.
Oof, this thread is quickly turning into "maxy has too much free time" ahahaha.
EDIT: OH! Rights issues, yeah. It happens occasionally, with stuff like all of Go Nagai's output basically being out of shueisha's hands, and with a few other authors who took their titles to other companies, but by and large I think a lot of titles just don't get modern reprints because A) they won't sell and 2) the sheer output of the time and everything the art would have had to survive through probably means the original art needed for decent quality releases is either destroyed or lost. It's a sad part of weekly magazines from before the digital age. Weirdly, some old unreprinted titles have pretty decent tank raws out on the net (or used to, rawscans' closure's removed a lot of those from the board), so Shueisha would almost benefit from them if they wanted to turn around and rerelease something.