I've been slow in picking up your posts but from your description of what you are trying to accomplish with your oven, you might want to check out this link (hope it loads OK) to a city park in Toronto, Ontario (Canada) that built a community-use oven in 1995 and has since built another.
Friends of Dufferin Grove Park | (Bake Ovens & Food) Overview - Composite Overview
They have obviously found it a real asset in bringing their very diverse community together, along with a cob wall, fireplace and children's play space that might give you some other ideas too, There's a lot of information here on their journey over the years. They built an Alan Scott barrel oven ... but I'm sure it's only because they didn't know about Forno Brave
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I have been working with a few people here to initiate something similar in one of our public parks but it's stalled at the moment due to some very apprehensive city councilors and the fact that the wheels of our local government sometimes move verrrrry slowwwwly ...
Whatever you decide to build, good luck! And please post it, so we can all see.
Sarah