yeah, although i'm confident it will work in some way..., i'm not sure about the temperature the bottom bricks will get to and if it will be enough for pizza or making bread. This also depends on the size of the fire. I could make a small fire for slow cooking and a big fire for burning things. I thought I could make a bottom tray/wire rack about 50mm off the bottom which would allow heat under the item? Then you'd have options, like a normal household oven. It's all just a theory at the moment, I don't really know what i'm doing, I'm just making it up as I go ... but I think it should provide plenty of entertainment conducting tests and figuring out what works best.
I'm wondering what the best kind of wood to use is? Not too smokey that my neighbours call the fire brigade, but nice tasting smoke for the food? I know a bloke that sells charcoal so I might get a bag from him. He says it's better than heat beads for bbq because the smoke flavours the food.
Now that's a good idea, a smaller fire tray on the bottom for use only when you want to do pizzas That'd work a charm I reckon!
For bread, you'd just keep the top grill and I'd envisage cook up a bbq grill and at the same time do a bread (or herb bread) below because you only want to generate an even 180 C for bread anyway. And for those odd occasions, when you want pizzas you just ark up the bottom burner and with those bricks as insulation it should get hot as a furnace in there.
Would you incorporate some clay bricks or firebricks or pizza stone as a base to throw the pizza on like a mini pizza oven or use pizza trays?
As for wood, I don't have much of an idea but you can get a smoke effect by using things like tea leaves and special wood smoke shavings from camping shops without actually burning wood. That may suit your design better - I'm not sure...