That is some nice metal work. Are those all 4x8 pieces of stock steel fabricated? Or did you get body panels from Blue Bird?
We had a local fab shop take 5x10 sheets and shear them in half, then brake (bend) the bottom 1" at 90deg so the sheets had rigidity! Worked out great, had a bout a foot left over on each side. It is actually skirted down about 3 more inches too!
If you ordered from Blue Bird I assume you'd get a sheet that went up and down, from the bottom of the windows to the bottom of the skirt. We only really had rust from the rub rail above the wheel wells and a LOT on the back, so it made more sense to just replace what we needed!