Spiral stairs help
#2
There's probably a rule, but you could measure any handy iron stairs. An angle of 45 degrees would not be too far out; there is a convenient/conventional size that we're used to and a different ratio seems tiring.

The connection would depend on why the stairs are there. Is there apparatus at the top? How far apart are they? Would you need a backup in case one tower fell down?
David
Moderato ma non troppo
Perth & Exeter Railway Company
Esquesing & Chinguacousy Radial Railway
In model railroading, there are between six and two hundred ways of performing a given task.
Most modellers can get two of them to work.
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