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BBQ Pizza Oven Lid

I am wanting a mild steel BBQ lid to cover a pizza oven I’ve put together for the BBQ. We’ve got a Weber Q 2200 and the lid doesn’t cover the height of the pizza oven which is frustrating, so I’ve got no way of keeping the heat in. The measurements for the cooking area are 540mm W x 390mm D. The height to cover the pizza oven would need to be at least 200mm. An engineer from Alpha Engineering came back to me with the following ideas but seems to be unable to complete the design. I have attached the image he included: "A simple mild steel box shape will be the cheapest option. Folded from front to rear with end plates welded on each side. The plates can be profile cut with little tabs hanging down to locate onto the base. I'd suggest some bracing around the bottom lip and internal cross brace under the top to reduce chances of heat distortion. We can add a single handle in the centre." Would be great if this could be done reasonably quickly - in a week or two. Thank you!