Thanks junior2016.
I have a 1-3/4” surfacing bit that I wanted to use on the spoilboard to get it perfectly in plane with the router. With a ½” shank on that bit, I wanted to use my DeWalt DW618 router. I quickly modified the CAD model of my existing mount, created the CAM setups, and cut out some new mounts from 3/4” Oak plywood. The drill press was used to make the holes for the clamping bolts.
With the DW618 mounted, I surfaced the spoilboard by finding the lowest spot and setting the Z height right at the surface. I turned the router on and then manually jogged it around to surface the area.