To get the dome exactly like planned I constructed the two identical faces in CAD and printed them on 4 A4 pieces of paper, glued them onto some 18mm thick spruce planks and cut them out with a jigsaw:
There's only one good method to in-cooperate all the ingredients thoroughly: stomping it like there's no tomorrow:
This is the result of a few hours stomping on mud like crazy and slapping it against the soon-to-be oven to create a nice dome:
Here you can see how the drum sits on the frame. The two (not painted) bars can rotate by a few degree.
That's it for part five of this series. Stay tuned for the fiery part six. What do you think is the best way to remove the wooden form? :)