You might want to consult/view: http://www.marinelightning.com/EXCHANGEOct2007Final.pdf
and Marine Lightning Protection Inc.
for some of the 'latest' thinking on marine lightning protection. On the surface, this is quite a different change/evolution from former 'in vogue' recommendations.
Also, the 'electronics' folks are also seemingly now advocating ultra-high frequency 'chokes' on all important 'electronic' equipment to prevent/retard the 'Radio Frequency' RF aspects of a lightning strike.
Been hit twice .... dont want to get hit again. One was an RF event that fried every electronic device on board (and that was not inside the oven), the other was an amperage event that blew a big chunk out of my keel --- so I kind of think from those two experiences that keeping 'lightning totally outside of a boat' and on the 'surface of the boat' is kind of 'important'.