immersion

Yo guys, So... My setup is basic AF with a converted 50L cool box as a mash tun, and a 33L steel pot on a stove converted with a ball valve. I then ferment in plastic buckets and keg/bottle depending what I fancy/the style. As basic as it is, I get some pretty great results. I'm about to do...

I've built a few copper immersion chillers in the past and I'm thinking of having a go at a stainless steel one. There doesn't seem to be a lot of information out there. Can anyone point me to a tutorial or offer their own advice? I need to know what grade of steel is suitable for bending. Where...