Like a big-ass ol' house of stone*, these ovens are built on premises, and once they're in, they're in. If the pizzeria closes, God forbid, or moves, that oven stays — or gets ripped out by the next tenant (a tragedy).
* That's Chatsworth House at top if you're wondering.
Think of it as the sleek prefab home above, which itself is built off-site then trucked in and placed on a solid foundation. Owners of both structures hope they'll never have to move them again, but they could do so if need be.
Think of them as the stylish Airstream trailers of the pizza oven world. Wherever they park, they always get a good number of admirers, most of whom dream of buying one of their own, towing it from place to place.
These, to me, are the American Craftsman bungalow of the pizza world, the sturdy old workhorses of many a mom-and-pop pizzeria. Older examples may have quirks that the owner just has to live with and work around.
These are the McMansions of pizza ovens, spreading banality across the face of pizzadom.
extreme homebrew ovens
Jeff Krupman's PizzaForge oven, made from a Weber grill with custom refractory concrete modules, is like a really kick-ass treehouse. You look at it and think, I want to do that, too. (Krupman is currently working on a way to sell PizzaForge kits, so you might be able to before too long.)