Looking good so far.....
Just my opinion here,
If it was me, and I was wanting to eat at 5 or 6 sun night.
Then I would wait and start my fire at like 4 am sun morning. That has it cooking by 4 30. Plenty of time to stall and still get done. And have time to rest.
I am not sure I would try and hold the temp from sat evening to sun evening. Thats gonna be a rough one.