Wow, that's a tough one. I tried building something similar and it was super hard. Can't help with blueprints but maybe start with just the front and keep adding? Good luck!

Wait i'm kinda new, isn't the cauldron used for washing dyed armor? Or is there more to it and they just abandoned it?

So, I'm kinda new here but needing to add glowstone or redstone to modify potions always felt annoying. Was there really a plan for a better system once?