A bit of trial and error on the fitting technique, but I think I got it down.
The caprail material is 1 x 4 inch PlasTeak (0.75 x 3.5 inch actual size). The top of the bulwarks vary from 2.75 to 3.25 inches wide due to variations of the deck and hull construction (hey, it was the 1970s). To help conceal the outer edge of the bulwark joint and provide a "drip edge", I shaved off about an 1/8th inch of material off of the material stock, from one edge to about 3.25 inches across the width. This left approx 0.25 inches to form the drip edge (which will face outboard when on the boat).
|Jointed plank, drip edge on the right.|
|Jointer jigged up with feather boards|
|Using a vise in the drill press to consistently spot the pilot holes.|
Next are the pieces aft, a slightly higher level of difficulty, where I must deal with the caprail T-track and join the pieces with a "modified scarf joint".