@swamprb, OK, door for pre-heating, great idea.
And I thought about cutting the Green MBH

but I went with the 18 for the size and the lid height.
I left the vent in from for several reasons...
I thought it looked better there.
Other pizza ovens have the stack in front.
Gave me a place to stick the therm.
The drag coefficient of the flame, combined with the thermal properties of the fire brick, and the thickness of the stone, divided by the volume of the charcoal and the BTU properties of the oak - had no bearing what-so-ever