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Here is a shot of the wheel arches. I am not interested in doing the grinding of the bevel on the outer edge of the arches. It takes quite a while and is not fun. I tried to get these cut on a 3 axis laser and have the bevel cut as the part was cut but the supplier couldn't do it after saying he could. It was a software issue so maybe he can do it now. The inner edge matches the wheel arch cut in the box side. The bevel is just a 45 deg champfer of the outer edge so it blends into the box side. The mounting holes are drilled using a template to match the holes in the box sides being careful not to drill through. They are tapped M6 to keep with the metric.
Only one of the arches show has the bevel and it is not finished yet. It needs to be feathered and blended better to mimic the factory.