I tell you what, I like the sound of the mud oven. Also, there is the oven which has a buried fire with an entrance at the front to pop firewood in and a chimney to draw the air in. I cannot remember the name of it at the moment, so will need to look in my library. Is there a source of clay in the area such as a river bank or a pond/lake?
Spam, not 100% sure if this particular area has clay but I highly suspect it has as I live not too far away and it's quite clayey (?) at a couple of spits depth.
I will make some enquiries.