The Flicka has more than enough displacement for ferro construction and many were built in this medium, nothing wrong with it. I have personally seen two ferro versions, the first being a beautifully built example, built at Span Farm boatyard in Auckland, NZ by a guy from Oregon and subsequently sailed home to Portland. The second not so beautifully built in Minneapolis. Interestingly enough I just bought an old copy of Nautical Quarterly magazine which had a story about the Flicka and was showing the article to our parts guy at work (just this afternoon) who has had a Pacific Seacraft Flicka for many years and while the article gives a displacement of 4500 lbs he says his is actually around 6500lbs, very easy to accomplish in Ferro. I don't know if folks built them from plans in one off solid glass but if so it would be no less work than in ferro to achieve the same quality of finish as the one I saw in Auckland. I have personally built a larger version, the Fred Bingham designed 24 ft Allegra hull for a client using the C flex method in solid glass as well as a Hartley RORC 39 ferro sailboat so I do know a bit about both mediums.
Steve.