I marked & cut a piece of 2x4, then rounded the cut edge with a 1/2" quarter round bit, which fit the contour great.

DSC00614.JPG

DSC00615.JPG

Looking at the back side, there's a nominal 5/8" gap at the center.

DSC00618.JPG

At Ken's suggestion I clamped the molding to the form and applied heat to the outer ends, and then along the bottom of the molding. Thought it had worked when I took off the center clamp, but when the ends were released it sprang back to the original shape so I cut a series of reliefs in the front edge and did another test clamp.

DSC00619.JPG

Next I'll grind away the gel coat across the front and 1/2 of the thickness in the cut areas. After a coat of wax on the wood form a couple of layers of fiberglass & resin should have it in good shape.

DSC00621.JPG