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Hello everyone, I am completely new in this field, my work so far has focused on plaster modeling. But soon I would like to start a new project, which requires a lot of knowledge in clay processing. I would like to make two fireplace surrounds (designed in the style of the attached plan), one for a decorative fireplace and one for a real fireplace which already has a cast iron insert whit a brick mantle. I would like to know for the first one, for the decorative one, I need to burn the tiles or not. It's about some large parts, for example 2 corbels 80x20 cm. Also I would like to know if such large parts should have any reinforcement system for example made of wire or iron. The material, the clay is good as I find it in commerce as it is or will need to be added some additives to avoid the appearance of fissures without burning. For the symmetry of the parts, I thought it would be good to carve one part and the other to copy it with a plaster coating. I look forward to any suggestions. Thank you all