As Rat pointed out in a comment on step 4 (and rightly so, good eye!!), the tops of the rockers really need radii aswell. There is a cast radius on the inside of the rocker box that is visible in photo above. Using first a 4" grinder for roughing, work the top edges down to match this cast radius. Then tidy up with a 90° angle grinder and Scotch brite to suit. I also took the sharp edges off of the outside and bottom of each rocker box face.
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