Re: 20 ft open topped sailboat.
I built a whole variety of Bolger designs similar to the Zephyr, starting with the little 12' Teal and Pirougue, and up past the 15' Surf to the 23' Light Schooner.
But I can't say I really recommend any of them. They are adequate substitutes only for casual sailing in protected waters for those with relaxed expectations of performance.
I now myself sail a sibling of the Caledonia Yawl family.
I ain't never going back.
Amphibious Macroplankton Oughtredia doublendus
Mostly found frequenting the littoral and estuarine zones in the southern half of the Salish Sea, though sightings have been recorded both north and south of this area, and occasionally, but rarely, inland, in freshwater environments. This species lives on micro-brewed beer and dutch-oven biscuits,and displays brightly colored nylon and gore-tex plumage during the rainy season. Approach with caution!