Down to where I can see the bottom of the depth limit holes so I marked each one with a pencil.

After more planing, scraping, rasping and sanding, it looks like I’ve finally hit bottom.

But of course after I blow the dust off, there’s still more material to remove.

I think one more session will finish it. I’ll check it against the contour gages to see how close I am, then start working in the opposite side.