Had you done two in each bay, it could be even without using more vents.
Just saying
I know I sketched out various options, pretty sure that one didn't give me enough vent area, I needed a few extra. Once I added them in the 3, skip, 3 made the most sense.
Found this. Basically 1/4 ply with nicely machined bead. Not designed well for butting edges. Might want to batten seams.
I looked into that, pretty sure it was all warped and wavy at home depot and the lumber yard so I went a different direction
The ply is around $1/sq ft. I found vinyl and other products that would be acceptable but all I the $8/sq ft range.
PVC edge and center. 16' lengths were about $60 IIRC, I can go get my invoice if interested
