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Hi Jason, it will depend on what F ratio the 12" is going to be. An F5 - 6 would fit okay in a 3 metre ID dome okay. If you want room for extra people then 3 metres could get a bit crowded.
You will also have to work out how tall you want the wall to be that supports the dome. Some domes go to the ground and some sit on a wall.
All the best.
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