A little late, and you've probably already figured this out, but I'll try to answer some of your questions.
I'm pretty sure that the one piece ceiling panel was the last panel that I removed from my '64 Countess. Cabinets & furniture were removed first, then bottom wall panels, then upper wall panels, end caps, and finally the one long ceiling panel. I think.
The fiberglass end caps weren't really all that heavy. Easily lifted by one person, but it's handy to have two people just because they're a bit clumsy to handle alone due to their size.
I don't intend to remove my shell, but if I understand it correctly you need to provide some sort of support to hold up the shell, then remove the rivets that hold the trim around the bottom of the outside of the shell, remove any other rivets from the bottom outside edge (if there are any), and lift. There are a couple of methods used to lift the shell...gantry with a beam against the inside of the ceiling or jack it up from inside...choose one and go at it.
Hope that helps.
-pp
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