Quote from rypkord
Doujinshi is basically a fan manga, some include innocent stories that fans make up others include more mature themes. A popular thing with gundam is yaoi though plenty of hentai doujinshi is made as well.
No, a doujinshi is a self-published manga and is not fan made only. While this is often the case, it's not rare that a professional mangaka decides to make his own circle.
Quote from RilleL
You should go to the gundam series info page and update them with all the connections.
You should put more attention to what rypkord said. He specifically stated that all the series that he mentioned are animated. He can't update a info page because this site is MangaUpdates: It lists manga, not anime. Don't be confused, the fact that a series has a manga counterpart doesn't mean that it has the same contents (and therefore storyline).