Whatever you do, make sure that the lightning ground wires you lead through the cabin are enclosed in plastic wire conduit. Otherwise they could spray molten copper in all directions.
Beyond that, you can get all kinds of professional advice. The truth is that lightning effects are highly unpredictable. Ten strikes under identical circumstances with identical equipment, can lead to ten results. That's why valid advice based on real life experiences can be so varied and frustrating.
One of the most fun things I ever did was working in a company that tested devices for lightning. We shot rockets up into thunderclouds trailing a wire behind them from a spool.The base of the wire was attached to the device under test. WHOOSH-KAPOW. Man oh man what a rush. Anyhow, the point was that each protection scheme had to be tested with a dozen or more strikes to have confidence that it really works in every case.
In 2004, lightning hit the boat moored next to me. I think, s side streamer crossed to my boat. The grounding conducted it to the dynaplate. However, the EMP (electromagnetic pulse) fried my SSB, wind, and radar anyhow. Actually, the EMP from the hit next door could have fried my stuff, even without the streamer. My boat's grounding was irrelevant to the outcome.
