Hello,
A nice SAFE way of making a Keel bulb, is to laminate one using Lead Flashing.
The Flashing can be cut with scissors, laid out flat and soldered together with a BIG Soldering Iron.
When enough Bulb panels have been cut out and weighed, clamp them all together between two pieces of wood and solder along the panel edges.
A streamlined " Shark " shape can be made by reducing the panel size on each side.
Also make the cutout for the Keel BEFORE soldering the thing together!, just leave a suitably sized gap in the middle.
ALL the bulb panels should be vertical and in line with the Keel.
Rasp the Bulb into shape, check the weight, Filler all the rough bits, Epoxy to the Keel.
Drill some small holes thro the Bulb and Keel, to take Brass Rods to make sure it dont fall off !!.
JayDee.