[m_in_m]

Presumably because there's no rear projection to take account of, and the one wall is slightly trapezoid so following the structural line of the studio.

Interesting though the PTZ on the back of the tower is being used for the weather, which suggests it's ever so slightly too narrow to use a normal camera/ped in that area.

I didn't realise that was the PTZ but that presumably means it should always be perfectly aligned - assuming the tower doesn't move.