You can buy a dome from archwaysandceilings.com It's sooo much easier than trying to do it yourself.
Dome
A dome
The "dome" is the light on the ceiling of your car. It is called a dome because this light is usually shaped like 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.
it holds the tension of the dome
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.
a dome that is built out from straight parts
Dome
The ceiling of the Pantheon was dimpled "like a golf ball" to relieve stress from the dome.
Apotheosis of Washington.
80 feet