Lets start out at the bottom of the tank.
This tank is a full drain version. There is a 1.5" to 1" plastic bushing, 1" Nipple, ball valve, and another nipple at the bottom.
Moving up to the racking port, this is an off the shelf weldless unit from Brewhardware
https://www.brewhardware.com/product_p/mwl12cooler.htm with the nut replaced with a valve and a camlock added.
Or maybe was this diptube with a valve on it - I dont remember...
https://www.brewhardware.com/product_p/diptubewl58.htm
Here's a shot of the interior of the diptube.
A little higher yet is the thermowell for my Brewpi.
This one came from Brewers Hardware
https://www.brewershardware.com/6-Weldless-Thermowell.html?category_id=316
Outside Picture
Inside Picture
Moving up to the weldless thermometer from Brewhardware
https://www.brewhardware.com/product_p/thermot325.htm
I added a washer, rubber washer, and stainless nut to make it weldless - I think he sells them that way too.
Outside Picture
And inside picture
Finally for the lid
I removed the black plastic ring off of the top and sealed between the ring and the tank with clear kitchen silicon sealer. I used a whole tube and need to do it again.
On the lid, I put foam rubber window seal with adhesive on one side.
For the blow off system, I took a plastic FPT 1/2 Union, a 1/2 short nipple, rubber washer, 1/2" FPT elbow, and a camlock and made this.
Inside
Outside
And my latest addition is a CIP system (Looks like the beer stone is getting a bit thick - I need to acid wash it...)
Cip Ball
CIP in action.
https://www.youtube.com/watch?v=oVnLNKz4Clg
My inaugural Conical Brew three years ago.
https://www.youtube.com/watch?v=NhJiKAJYOL8
I'm happy to answer any questions you have.
Russ