[MrForbes]

I was trying to figure out the exact dimensions of the TOWER, and discovered that sheets 2 and 3 are missing from Drawing GE-10030. They determine the height of the top rails. (edit: and the horizontal rollers, which are on the bars across the front and rear edges of the platform)

Generally the descriptions and dimensions in the ARENA section of the manual are iffy, you need to study the field drawings carefully to determine how the field elements are actually built.