Last night I attached the rear two pieces using a jig to set the angle, hope there still hanging!
Now I have a stumper ?
Sag in the roof 1/4" to 1/2".
Using 2" foam not attached span 75" X 8'
Pieces are cut just resting in place
Hang it upside down then FG

FG with a tiny crown then attach ?
As my wife still wonders if the floor will hold her weight let alone mine
