So I have now put in the angle bricks that will help the dome bricks make the arch without to much use of mortar as they are rectangle bricks not shaped bricks.
once this excess was all cleaned up it looked really good, all i do is a scourer and then a sponge, it may look in the image that the back is also angled but it isn't. you can see the ash dump hole infront. 
this was just a mock up (no mortar) before i did the angles, just making sure i have the right plan in my head. you can see here left the hole for the ash dump, i have set up the entry width, and i have mapped out the front of the oven to make sure its all going to fit. what you can't see here is the BIG consideration of where the chimney will be, which is almost directly above the ash dump.
Here's my daughter in the oven with some mockup bricks at the front for the drop down bricks which help th esmoke come out of the oven and up the chimney, its called "draw" so google it. 
here you see a good look at my front layout, the dome will be where the angle bricks are, then there will be a front section that has angled bricks to "drop" the smoke, then there is a brick (2 bricks upright) that will be the chimney space. what you can't see in this image is the FRONT FRONT section which will be the arch that SHOULD not get any smoke and not turn black as i am using cream bricks, ALL the smoke should exit before then.
once this excess was all cleaned up it looked really good, all i do is a scourer and then a sponge, it may look in the image that the back is also angled but it isn't. you can see the ash dump hole infront.
this was just a mock up (no mortar) before i did the angles, just making sure i have the right plan in my head. you can see here left the hole for the ash dump, i have set up the entry width, and i have mapped out the front of the oven to make sure its all going to fit. what you can't see here is the BIG consideration of where the chimney will be, which is almost directly above the ash dump.
Here's my daughter in the oven with some mockup bricks at the front for the drop down bricks which help th esmoke come out of the oven and up the chimney, its called "draw" so google it.you can get an idea of the internal height by counting the bricks in the background.
this is a good vid for the drop brick "look" http://www.youtube.com/watch?v=revPSeHiJDw&feature=related at 58secs into it, but i can't work out if they have a chimney or the smoke comes out the front???
here you see a good look at my front layout, the dome will be where the angle bricks are, then there will be a front section that has angled bricks to "drop" the smoke, then there is a brick (2 bricks upright) that will be the chimney space. what you can't see in this image is the FRONT FRONT section which will be the arch that SHOULD not get any smoke and not turn black as i am using cream bricks, ALL the smoke should exit before then.you can see i have plenty of room at the front to achieve this.
the oven door is 34cm wide and 34cms high.
i saw today a statement that the oven door should be 2/3rds of the height of the interior, thus my interior needs to be 51cm ..ish high, i think the sides are that but the top of the dome is @ 70cm+ i think?
