Sorry you didn't find any Dingo experts here. It's been a long while since they were built so there can't be very many still sailing.
If you haven't found it, there are photos of Dingo cats rigged here.
http://www.thebeachcats.c…pictures?g2_itemId=64759
Maybe the pics will help.
I would suggest that maybe you could make a temporary forestay out of low stretch rope, tie it where the forestay would go and adjust till it is right and then measure the rope.
A few inches short is better than a few inches long if you have to choose, because you can always add a multi-hold stay adjuster at the end to increase length, hard to make it shorter.
Good luck,
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Damon Linkous
1992 Hobie 18
Memphis, TN
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