One particular modification that you have made, internal halyard masthead blocks, is one i am definitely interested. Once I get some headspace for this modification I will be in touch, most probably in April/may when I attack the mast and spars. One question that I did have; it would seem likely that the halyard could get caught over the top or to the side of the block, during squally weather which would most surely cut the halyard in quick order. Had you considered a SS 'chock' welded on and bridging the entryway for the halyard? I admit this could add leverage of a twisted halyard to bend the entire assembly causing more serious problems...