I have purchased a second hand hot water cylinder that I'm converting to a 150 litre boiler.
First I gently cut the aliminium wrapping and took of the top of the cylinder cover. I suspected that the cylinder would have a rounded top so I had to be careful to not hurt the copper under the foam.
I then carefully cut away the foam to expose the copper and cut off the top of the cylinder. I intend to convert the top to a lid for the boiler. As I was working with it, I got the idea to get another one and make a large pot still.... Hmmmm
It is quite hard to work the copper without damaging it as the copper is quite thin. The edge of the boiler is uneven but I'm sure I can tailor the lid to make it resonable tight.
(And I can not find the last image. Will bring it out next week for a new photo. )
Next step will be to time various steps from power on till boiling using water.
I have also purchased a large chilly bin that I will use for the mashing. As the mashing/striking takes 3 to 4 rounds of water, my 50 litre chilly bin should be enough to fill the boiler.