I had to figure out how to center the fiberglass cylinder half on the plywood before attaching them. I sharpied a line down the center of each half before I shaped them with sand paper. Positioning the holes for attaching the light cylinder was another brain teaser. I measured down the light cylinder to the point that the actual light fits up the cylinder to allow a hole for the #6 attach screws to not interfere with the light. The only perpendicular surface to measure from was the light cylinder end flange.
With the hole (down the cylinder) measurements, I located the screw hole positions on the fiberglass halves. I then drilled the holes and countersunk them to accept the #6 screws. Sounds easy but was very confusing.
I inserted the light cylinders into the fiberglass halves and marked the holes onto them using a sharpie through the halves holes. I then drilled the light cylinder holes and tapped them for the #6 screws.
Next I mixed flox and epoxy and filled in the space between the plywood and fiberglass halves. I'll let them cure for 24 hour before sanding and shaping.
Centerline drawn on halves.
Centerlines aligned with plates to match holes in 120 degree face.
