Reply #45: I've Checked My 1964 Set Of PRELIM. Building Plans For The Towers

[Christophera]

and the elevator sheets have some information that may help.

The 40th floor was the bottom of the mechanical and 26 feet over that was the bottom of the sky lobby which had a 14 foot ceiling.

From the roof down was a 24 foot mechanical room that didn't reach the perimeter. 43 feet down from the roof was the floor of the 103rd floor, the observation deck.

There is no floor plan for the mechanical or skylobby floors.

Also a comment on the term "squib"

http://en.wikipedia.org/wiki/Squib_(explosive)

The term should not be used at all because it refers to a low explosive (gunpowder) initiator. The proper term is "charge(s)".

A comment on shape charges.

A shape charge adequate to sever the supposed steel core columns would reach, in a single direction, from the core out to the perimeter. A series of them would produce something similar to what the red arrow points to, but in my estimation, if it were adequate to sever the steel column, the explosion would be much larger vertically. It would involve at least a floor above and below by the time it expanded to the positon of the perimeter. Cutting steel with high explosives requires huge loads.