i used the Matt Walker Stoves plans of the continental type stove to build mine , , with a slight variation ,and the back brick section that rises up above the stoves top level ---are not part of the stove ---thats just a brick wall heat shield---spaced 40 mm away from the stove main body and spaced away by 50mm from the corrugated sheeting ---another heat shielding---behind it. The Firespeaking stove incorporates a chambered backwall of sorts onto the main stove body --- that houses the oven ---and provides mass as well ---2 different styles and layouts of a wood burning stove build. I fabricated my own metal components ---as i too could not afford the bespoke cast iron ones---let alone the import costs ----the products used by firespeak are made in poland for them ,i believe , which although closer and not having any extra import tax imposed on it ----as all usa goods imported into the eu now have---would still be out of my reach .