I am starting a new diorama involving a Meng Me163 in its hangar being in its final stages of production (a proper thred will be started soon).
I am still in the starting phases and I am doing a bit of research of what one can find in an hangar. I am considerng a ledder-like object with a kind of balcony on top on which the mechanics can walk or stand during work.
My question is: how they are called (I don't even know the Italian name of it...)???
Does anyone of you know their name so I can Google it?

Thank you
ciao
Edo