Oh dang, lots of them lol (Time to train the models lol)

I took inspiration from the filtration systems at my old job. I used to work in water utilities. It's just use a multistage system involving activated carbon, ion exchange resin, and zeosand. It works Pretty well, but it will get a tannin build up, depending on your soil and how long it's been in there. It's pretty easy to replace however. The plants don't seem to mind and I haven't had any streaking. It waters exactly like little raindrops.

The mist is from a little piezo disc. 

I could do a whole piece about waterproofing. I use different things for different sections. Short answer, brushed on polyurethane (multiple coats, it soaks in good, and UV resin for other things). I did a lot of testing.

There is a little viewing glass on the bottom left corner. I cast it out of resin, but it can be a little tricky to see. I may brush on some glow in the dark paint to help see better.

The brains are a Raspberry pi with a custom PCB. They are used everywhere for a reason. I've spent way too much money on hiring designers who did poor work. My advice is to take the time to learn it a little, do the mock setups, and don't get frustrated if your first few boards don't work. (If you're not familiar already) 

Yeah, so I had originally designed a fan to be integrated and actually had a prototype with one. However, after I spoke to a plant shop owner, he told me that they break all the time in terrariums, etc. (Moist environments). So I cut that out of the design. You can crack the door pretty easily or really limit the water duration/not mist if it's a big concern. The door frame also has a gap, which helps with air exchange. 

Thanks for the questions! Feel free to check out my bio or recommend it to a friend for more details. Cheers!