See if you can access this:http://a4.sphotos.ak.fbcdn.net/hphotos- ... 9604_n.jpg
It's on facebook and I've been having issues linking to my albums from this forum. If you can't open it I can email you the pic.
It's from the H16 assembly manual (which I can also email you). In it you can clearly see the right way to attach the trap lines to the mast tang. With a total of two trap lines, one on each side for soloing, they attach to the upper two holes by way of a dedicated shackle that fits through both (bolt is on top).
If you have a total of four trap lines, for skipper and crew on each side, you add the additional wires to the lower, larger, main shackle that also holds the two shrouds and forestay. Yes, if adding the third and forth trap lines to the lower shackle they are placed on the outside of the shrouds with the forestay in the center.
As for the shock cords, you need one for each pair
of trap lines. They connect to the bottom of the trap line on one side, then run under the tramp frame and up to the bottom of the other trap line. It connects either with plastic hooks available at your local dealer, or you can simply tie them directly. The hooks allow you to remove the shock cord for transport/storage.
I modified my boat quite a bit to accommodate the whole system and can post or send you pics if desired. Other than that I recommend studying the assembly manual and the catalog which will give you a lot of the visuals on how the system comes together and how it can be modified.
Hope it helped. Let us know if you other specific questions.