To move my downhaul sheets under the tramp on my Nacra 5.8 I made a bracket to transition out next to the inner fore beam, to minimise friction I used exit blocks, http://www.onlinemarinestore.com/store/pc/viewPrd.asp?idproduct=32897&idcategory=429
it then goes across the deck a bit over a foot and enters the end of the beam so the join has to be free flowing, if I go any bigger with the exit blocks the bracket gets too big, these have a small exit so I cant really whip the line, on the Dyneema I stitched it pretty tight but doubt that will hold too well if it cleats where I stitched too often. I don't have to remove this when packing up the boat and am wondering if the Robline racing sheet would be strong enough if I removed the core at the join and splice the covers as in this video https://www.youtube.com/watch?v=4LbX7jLGkYM