Yes, that's the standard instruction I've seen on the forum many times. I currently use a towel folded over several times to insulate the probe from the cooler air temp. I use a bungee cord to hold the towel in place over the temp probe.
there are several threads on the DIY forum about the plastic conicals. Many brewers use them without problem. Check them out but they are definitely DIY and once you start to include fittings, the price does go up considerably. Good luck.
yeah, I bought my plate chiller and fittings from Bobby_M. His prices were good and I like one stop shopping when possible. Although my setup is a little different since I thought about replicating the Sabco chill wizard but didn't add the O2 stone at this time. I have achieved 60F wort out...
You might try leaving the bucket in direct sunlight for a day or two. Also a soak with a cup of bleach in hot water and then in the direct sunlight for drying might help. Just my $0.02. Good luck.
Great job. I switched from an IC to a plate chiller around the first of the year. I built a stand for chill wizard knockoff but I didn't incorporate the O2 stone like you did. Here is my version (I like yours better.)
Here's a link to a great build using the STC-1000 controller. https://www.homebrewtalk.com/f51/ebay-aquarium-temp-controller-build-163849/ and if you follow this document, you will get a great controller setup...
Never having tried this technique, I can't comment from experience but I would worry about the extreme temperature change of pouring hot wort into a plastic bucket that has a frozen cake of ice in it. Before doing this with wort, I would try it with just boiling or near boiling water. Just my...