Four P4 Conferences

Play in games -

Week 1 - Playoff Round 1
SEC -
•. SEC Team #1 vs SEC Team #4
•. SEC Team # 2 vs SEC Team #3

B1G
•. B1G Team #1 vs B1G Team #4
•. B1G Team # 2 vs B1G Team #3

B12
•. B12 Team #1 vs B12 Team #4
•. B12 Team # 2 vs B12 Team #3

ACC
•. ACC Team #1 vs ACC Team #4
•. ACC Team # 2 vs ACC Team #3

Week 2 -Conf Champ Game - Playoff Rnd 2
SEC Winning Teams play for Conf Champ
B1G Winning Teams play for Conf Champ
B12 Winning Teams Play for Conf Champ
ACC Winning Teams Play for Conf Champ

Week 3 - Playoff Quarter Finals
Per Highest Ranked Teams (1 v 4, 2 v 3)
SEC Champ vs ACC Champ
B12 Champ vs B1G Champ

Playoff Championship
B12 Champ (BYU) vs SEC Champ (Georgia)

National Champ - B12 - BYU

No idea how to incorporate G5 unless you incorporate the British Dover relegation to conferences