I think the medication has kicked in now, I feel much better.
I tried the bowling alley but they wouldn't let my dog in so I don't have an answer on that question either.
However, back on the fence again, I think the missing ingredient is Aloominum as the Americans call it.
Aloominum and alloys will indeed burn ( as some of the Falkland sailors found out).
It would easily be ignited by the burning jet fuel and might have combined with other materials to burn even better.
The streams of molten metal in some of the videos would support that.
Since the towers are now gone for ever, and there are probably no more buildings of similar design anywhere, there seems no reason why the detailed building and construction plans could not be made public.
Hard to accept the computer modelling of the collapse when there is confusion about the true construction.