Filling a ding on a big block valve cover advice needed!

I had a body man friend do a set of stock valve covers for me. I removed the tabs and just wanted them smooth for factory '67 turquoise engine paint. He just treated them like a small section of outer body skin - metal worked them as well as he could with stud gun and hammer/dolly, thin coat of filler, lots of block sanding, then painted in a booth with single stage PPG.

Came out awesome.