Re the shipping question.
If you ship something UPS, it must be able to survive a 4' drop to concrete and be able to be turned over. And have at least 60lbs dropped on it.
Writing fragile is for those who can read and care. The double method mentioned is the best. Use peanuts or air bags. If you really want to track it, pick up excessive force shipping indicators. They will trip or indicate if a box has been mistreated or handled rough beyond normal. They have differnt levels of abuse.
My best advice is make the diorama so that it can be separated into components. Anything fragile like antennaes, towers, trees etc must be taken into account and have some sort of rigid canopy over the whole thing. Then the rest of the components can be assembled upon arrival. We used to send a model builder to the site when we sent commercial models to assemble the parts. This helped with shipping costs and logistics. If this is not feasable, then I would do it in such a way that instructions can be provided for the completion or a hard shell or case is built around the diorama, everything is secure and then double box that.
You might go to your shipper and tell them what you are trying to ship and see what they suggest. They want your business and don't want to pay a settlement so they'll either tell you no, or give you the info needed to successfully ship your pkg.
Good luck.
Mike
Mike
"Imagination is the dye that colors our lives"
Marcus Aurellius
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