I like what you're doing, Antoine. If you are looking for suggestions, I was able to produce a smoother result on my hammerforms by
1. Using a softer (non-metal) hammer to produce a witness line around the perimeter of the cut-out in hammerform at the very beginning and
2. Use a hardwood corking tool that was driven by a metal hammer to actually stretch the metal to shape. I did it in a few passes, not all at once.
This worked better for me than trying to form it all with a metal hammer that didn't fit the contour as well. It was easy to saw & sand the wooden corking tool to the shape I wanted. The resulting metal surface was much smoother than what I produced with a metal hammer.
You may be able to make and use one to easily smooth up what you've already done. Making one with shoulders on it, matching the finished profile of the original panel, would help equalize the depth.
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