I plan to attach 1-inch fir to all the ceiling and wall ribs. Then use 1/4-inch closet paneling Lowe's and Home Depot sell. I have seen this put up with spacier's, maybe 1/8th, so it is breathable. I will use probably the same 1-inch dry wall screws to attach the paneling. Probably paint the screw heads to match. The spaced out paneling didn't look too bad in other builds, but we will see.