B or D, but A and C also work, but you may lose slightly more wort, especially with the steeper cone angle of A, because you can't guarantee to drain...
Assuming you are starting at 1048 (12P), try allowing it to rise up to 54 to 56 F once you have got the gravity down to about 1025 SG (6.25 P). Hold...
Friend of mine is 5th generation German brewmaster with 2 degrees in food and brewing and global experience big and small. He has been trying to get...
I would suggest 3BBL at a minimum to ensure that it is sustainable. Direct fire with mains gas or bulk LPG would be best, but you could go electric....
This should be a pretty easy move. Use a magic marker to number and identify each pipe you remove. Example: Kettle 1 to Kettle 2, K-2 -K3, K-3 to BV...