You can buy a dome from archwaysandceilings.com It's sooo much easier than trying to do it yourself.
Dome
A dome
Dome light
Disconnect the fixture wires and remove the central mounting nut to release the dome from the light fixture in a ceiling fan.
A dome ceiling light provides even illumination, reduces glare, and adds a modern touch to the room's decor.
it holds the tension of the dome
a dome that is built out from straight parts
Yes... If you haven't built it properly! Because of the dome-like ceiling, carbon dioxide can build up with you sleep and you could suffocate. Many have. In order to prevent this, you have to cut a small hole in the ceiling (however wrong this may sound!) so that your carbon dioxide won't build up inside the structure.
Dome
It cost 10 million dollars to build the Louisiana Super Dome
The ceiling of the Pantheon was dimpled "like a golf ball" to relieve stress from the dome.
Apotheosis of Washington.