I am pleased how my refurbishing the inside of the case turned out.
I used two one-inch and one half-inch layer of polyethylene foam, cut to case size. To make the layers fit flush in the lid and the lower half of the case, I needed to thin two of the foam pieces. I used a bread knife on a cutting board, with a thin book under the point of the knife to keep the far edge of the foam cut in place while I eyeballed the front edge as I cut.
The four-layer fit was pretty good, but to get the corners of the lower half insert perfectly flush with the top edge of the lower half, I sliced four thin shims off the remaining foam, one for each corner, placing them below the second bottom layer, beneath the layer under the gun.
To cut the one-inch layer to fit the revolver and extra cylinder, I made outlines of both on a thin piece of cardboard, cut along the outlines with an X-acto knife, and then pinned the outline to the foam. Following the cardboard outline, I used a thin box cutter and the X-acto knife to cut the foam.