All of the grounding in the world wont save you from a direct lightning hit. Everything tied together will electronicly fry. My keels are fiberglass with lead encapsulated in glass. What I have done works for me, I have a 10 foot piece of 1/4" stainless steel chain that I clip on to the upper stay turnbuckle and the bitter end is dropped in the water. I put it out only when there is a bad lightning storm and I am there in the middle of it. The ocean is a big battery and it will drain any current picked up by static aloft as well. You can even put a small zink on it if you like. An when you are in your slip, you can tie a wire to your main bonding ground and bolt a large plate zink to it an let it hang over the side. You will discover you prop zinc will last 2 to 3 times longer. To get away from thru hull electrolsis is to install plastic thru hulls, do you trust the? No not really but they seem to work. You have them in depth finders and paddle wheel knot meters and they work for that. Red bronze was created in England back in the late 18th century for wooden boats and has good properties. Back to the age old question, Bond all or not bond? I also installed a 3.5KVA Isolation transformer on my power coming aboard thru a 30 amp power cord and get ZERO electrolis from shore cords, yea it was 1300 bucks but one haul out and replacing thru hulls cost much more. And I have two Flicka 20s and in process buying a BCC 28 in the weeks ahead. An Yes I will set up the BCC the same way as I did the Flickas. What is the price you are willing to pay for peace of mind so you can concertrate on sailing rather than counting how many times the bilge pump cycled in the last hour while you are away from civilization on the water. Take it as you will but these things work for me an I am sure there are more ways to skin the cat on this issue.