First off Rick, good luck to you. Are you able to acquire/rent/borrow another WSM? Can you recruit a few extra hands to assist the monster task and use a neighbor's oven for re-heating?
I've cooked two full (flat/cap) 15-17 lb briskets on the top rack of my 22.5" WSM. One was flat on the rack, the other was laying halfway on the rack and leaning on the other. You should be able to fit three flats without the mod to your WSM. I buy untrimmed briskets then trim myself so there is a good layer of fat to protect it from drying out. I concur with misting apple juice. I cook 8-9 hours in the WSM, pan/wrap to finish in a 300F oven (3-4 hours, int temp 205F) then drain (save the au jus to mix with your sauce) the pan and rest for 1-2 hours in a towel lined cooler. After cooling, I pack and seal in freezer bags. I've never cooked trimmed flats but I would think that slowly reheating in a covered pan to holding temp with au jus and apple juice spritz the morning of serving then holding it in a towel lined cooler is the way to go.
It would seem you need a 2nd and 3rd set of hands to assist and monitor during the ceremony so you can attend to paternal ceremonial duties.
Do you have an electric knife for carving? That and another WSM/UDS and extra hands would be on my list of needs.
I've cooked two full (flat/cap) 15-17 lb briskets on the top rack of my 22.5" WSM. One was flat on the rack, the other was laying halfway on the rack and leaning on the other. You should be able to fit three flats without the mod to your WSM. I buy untrimmed briskets then trim myself so there is a good layer of fat to protect it from drying out. I concur with misting apple juice. I cook 8-9 hours in the WSM, pan/wrap to finish in a 300F oven (3-4 hours, int temp 205F) then drain (save the au jus to mix with your sauce) the pan and rest for 1-2 hours in a towel lined cooler. After cooling, I pack and seal in freezer bags. I've never cooked trimmed flats but I would think that slowly reheating in a covered pan to holding temp with au jus and apple juice spritz the morning of serving then holding it in a towel lined cooler is the way to go.
It would seem you need a 2nd and 3rd set of hands to assist and monitor during the ceremony so you can attend to paternal ceremonial duties.
Do you have an electric knife for carving? That and another WSM/UDS and extra hands would be on my list of needs.