And so it Begins!

[Neil.B]

You could just build an arch within the inner arch to reduce the size (if needed), this would also enable to be offset for placement of a door.
Maybe worry about it after you start cooking and adjust if you feel it's necessary.
I'm sure it will be fine.

[4rjn]

Thanks Neil. Sounds like a good idea.

[Neil.B]

Don't take my advice...i haven't built mine yet