Hi, Jay, and welcome to the forum. There is no problem with the size of the oven, particularly if it's used often, as a community oven and doesn't have to be started from cold every time.
I'm a litte concerned about the drawing you posted in the photo gallery:
This shows the flue exiting the dome at the back of the oven, instead of over the doorway. This is a really bad idea. Instead of having a circular path of the combustion gasses that heats the dome, all the heat you get from your fire will be sucked out the back. Also, if you do retained heat cooking, it will be impossible to keep it hot for any length of time with a big hole in the back.
I know you say that there's no shortage of fuel, but it's still work to cut and haul it, you might as well make the most of it.