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Be VERY cautious about open cell foam on a metal roof along with finishing the inside with drywall or walls of any kind.
All metal roofs leak. No matter what. Standing seam, exposed fastener, hidden fastener.
The leaks come in different forms. Exposed fasteners that are on our metal shops literally leak after about 5-8 years or less. The rubber washers get too compressed during install and our buildings flex with heat and cold so the panels are always moving. Straight up leaks. Guaranteed
Then no matter what roof design metal condensates on the back side. 100% guaranteed.
Open cell foam is a sponge. Moisture of any kind is it's enemy.
Closed cell is what you need. Nothing else. I promise you man. Seriously look into it. Research the product like crazy before you drop 8k
I've read this a few times and can't figure out if you're for spray foaming or not my thinking is closed cell foaming the walls and nu-wooling the ceiling