The picture is of the base of a mobile table. It is formed out of 4 pieces of aluminium. The pieces are welded together, hammer and dollied flat at the welds and then ground and polished so the welds disappear. The tolerance for flatness is 15 thousands of an inch. If you look there is a straight edge on the top to show it is flat. It is a challanging bit of work but as you can see some of the same pieces could be used on my hood and intack scoop. Just have to work it into my schedual.
The whole back of my car is a cancer case so it needs replacing soon. It is presently covered up with bondo and a poor paint job. As far as the engine bay is concerned it does not look like anything special. So much to do so little money and worse little time. LOL