Not seen them pics before, thanks for posting thrm. I don't get why no 2 is saying standing lower at 32 degrees when hes even wrote 25 degrees max steepness?
I have just assumed that the lower is shallower than the upper, so I might be wrong. I know 25 degrees is max for safe standing but there is no max for standing in rail seats, but then he's put treads down as 350mm in no2, which is safe standing treads?
If you have a constant gradient that also means maximum height and distance from the pitch meaning fans are just further away. Steepness is just an illusion of closeness.