Here are some scans of Dairoku Tenmaou Great's Glorious Doujin which is impossible to find now along with his part works.

I don't know why it is hard if not impossible to commission or ask for restocks of old Doujins.
The person who sent me these scans did not have a scanner and there is some smoke damage and yellowing in the pages.

Unless the artist has another run printed there simply aren't any books to replenish stock. Chances are that the artist doesn't even have the manuscript anymore, much less any desire to reprint an old book in the first place.

Base +6, brotherdudejack +10, Chanel Williams +8

That seems to sadly be the case. There are so many classic doujins in need of archiving as I posted pics of what I could find of a Rain Mikamura Doujin from Doujinshi.org before the lights went out for that site.

Base +10, brotherdudejack +10, Chanel Williams +8