Thanks for the bumps /a/nons. I'll see what I can do to find each of the doujinshi mentioned while I was sleeping.

>>280033206
>comiket is like 80 years old
Here's what I believe is the single most ancient doujin work uploaded to exhentai. This mecha-loli doujinshi is a group work made in comiket 21 all the way from 1975!!
https://exhentai.org/g/1341841/d6df67784f/
Researching the artists a bit, it turns out one name, ちみもりを, mentioned in the index, is the pan name of the man who authored this ロボット刑事キカイダー絶倫 chapter. If I'm reading this right, his real name is Yoshiki Takaya (高屋 良樹) who...
...made Bio Booster Armor Guyver...

Holy fuck.