Hey Lancer
Pictures please

and check octoforno build and my build as the landing you are referring is a flared entry we both did this for the same reason [if I have got your description correct].
My outer landing arches wrap around the entry arch but never touches it and is also insulated from the dome. The rebate into the entry arch is around 25mm only. So basically a full brick reveal.
That way you have full view of the inside from any angle.
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