Those are probably the coolest brackets I've seen! Very nice. Did you drill holes through the 4 corners of the base & through the brackets and add thumbscrews to secure it in place? You might find yourself getting a few requests for those
I can see in your pics that the lid isn't quite all the way on. Start at one end and slide your hand to the other end and it will snap down all the way. There is a lip on the inside of the lid which matches the inside of the Growth Chamber and prevents condensation on the lid from getting out - so you want that to be snapped into the top of the Growth Chamber. The Growth Chamber is sometimes a little bowed inward due to cooling shrinkage out of the mold, so you have to get the lid on at one end and swipe across and that will get the two parts locked in together.
No thumb screws. There is a small lip on all the brackets to keep the ATS from sliding left/right and front/back. That along with the rigid plumbing keeps the ATS pretty snug and stable.
Yep. I fixed the lid after I posted the picture.
Very nice unit BTW. This spot in my sump was where I had a DIY ATS a long time ago. I got rid of it because it was plain ugly and a pita to clean. This looks much better .