NACRA 5.7 downhaul

I jist got a N5.7 and am trying to figure out the downhaul rigging, pics or tech drawings would be a great help. It is a boomless rig.
Also, do I need to put on a clew travler? I can see where the previous owner hung the rear main sheet system, but it seems that this position should change depending on conditions and direction. Right?
I hope someone familiar with rigging the Nacra 5.7 will respond, but since you are new to the boat, you might want to look at the rigging manual available here.
the page with downhaul instructions is

Damon Linkous
1992 Hobie 18
Memphis, TN

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