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Only the yellow pylons which go down to the ground, at a somewhat smaller diameter than their passage through the roof membrane
At the point they go through the roof it's ~209m between pylons at the Dome.
On the ground it will be considerably less, can't find a definitive answer but the legs quite chunky and the feet protrude inwards quite a way.
Looking at it might be ok though. Can't imagine you'd lose more than 20m at each end which would give an internal diameter of ~170m.
In contrast the shortest diameter of the pitch at the Oval is ~140m. At Lord's it is ~130m.
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But there’s loads of ‘stuff’ inside the dome now rather than a big open area? I wouldn’t have thought there’s a big enough space to fit adequate cricket space in is there with the cinema, venues, restaurants and shops? Not sure if this is the actual floor plan these days but looks about right from when I was last there I think.
Only the yellow pylons which go down to the ground, at a somewhat smaller diameter than their passage through the roof membrane