I decided to attach the sill portion with bolts drilling slightly oversized holes in the brace and then tapping the holes in the native rocker sill. I trimmed the edges to fit as perfectly as I could, filled underside contact areas w/panel bonding epoxy (E6000), then put the bolts in. I welded the shafts of the bolts and cut them flush with the brace before completing the welds around the bolts, edges at the fore/aft frame bars, and along the floor pan portion.
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