If you’re going to use that as a fermentation tank or bright tank, you’re going to really need someone who has the setup to do that as noted above. Just cutting it presents problems. I tried to cut down some SS to put down in my mash tun and it got hot and warped.
Delta Airlines TechOps has a bunch of stuff on-line that goes into SS welding and I think you’re going to need to purge the weld side and the back side to do that. AFAIK, I have not seen anything in the space that can do that setup. You might also need something called chill bars. I kind of gave up on SS after reading a bunch on it and decided it’s not really for the hobbyist welder, especially food grade stuff.
Maybe call over and talk to Ian or Nathan and ask them who they used the last time they built the fancy hopper.
EDIT - I didn’t see the condenser post on the kettle. Um, if that’s just going into a steam jacket, is it considered food grade?