Thank you very much for the feedback; I'm glad you've enjoyed it!
I have received requests before for micro machines (though I think it was for micro mining drills, not assemblers), and it is a very interesting idea... I can definitely make it work for vanilla, since there aren't that many assemblers. The full list would only be normal assembler 1-3, mini assembler 1-3, and micro assembler 1-3, which all fits on one line of the crafting menu (10 recipes to 1 line).
The problems would start when introducing the micro assemblers to any of the other supported mods, like Bobs, AAI, or Krastorio. I wonder if it would be better to have that as a separate mod... I don't think there ARE any existing 1x1 assembler mods on the portal, are there? Hmm...