Morning, Lyle! I know nothing as well. ‘‘Twas Torben who pointed out the A-0 / A-1 series have no cooling slots. Slots came later.
I almost, nearly, “fingers crossed” have the fills on each half where they need to be. The transition to the panel edges is toughest for me to see without adding primer. I had to shine a light on the area to decipher what was happening.