For my walls & ceilings; I installed rivnuts & fabricated my ceiling & wall panels from prefinished birch plywood. Then removed it all & then insulated & then reinstalled the wall & ceiling panels.My first regret:
I should have put up my wall and ceiling frame & furring strips before putting the polyiso foam board and gap foam in. Would have been way easier to fit that stuff around the furring, rather than the other way around. Alas...