A few more notes:
-Silo 4-H4 is accessible from three floors (four if you count the inaccessible walkway). If you restore the beta elevator, this will be by far the most "busy" silo.
-Consider that since GE:S allows jumping, people will be able to hop down from the walkways to other walkways below.
-The two inaccessible walkways need to either be removed or somehow connected to the rest of the map. The most obvious connection to Silo W is to extend the fourth floor hallway past the fuel room, turn it left, stairs down a little bit and done.
- SIlo X is more tricky. I see two options: either a direct connection from the surface (if you include it), OR from the exit area create a new hallway going left, then turn it right, a long flight of stairs down, right again and done (so basically you wrap around silo Y).
- Since people can hop down to the bottom of each silo, there should be some way up from there. In the original game, there is a small ladder connecting the bottom and the first-floor walkway in silo W. Maybe ladders like this in the other silos?