It might take a little patience to find all those parts for a H20, but they are out there. The Hobie 20 didn't sell in near the quantity, or for as long, as the H14-16-18 but still a bunch were sold. Probably more Hobie 20's sold than (nearly) all other production catamaran models.
Since most of the catamaran manufacturing has been done by private vs public companies I don't think there is specific sales data available for most beachcats.
I would suggest placing a "parts wanted" ad in the classifieds with a list of your needs.
And keep us informed how your rebuild goes, always good to see a neglected cat come back to life!
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Damon Linkous
1992 Hobie 18
Memphis, TN
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