Apart from the older “established” 14’ cats (most, if not all of which were designed for ply and dating back several decades), all of the, so called, “performance” hull designs for 14’ cats (and most other sized ones as well) have, through necessity for their performance, “compound curves” in their hull shape that make their manufacture out of ply virtually impossible. There is just so far you can “torture” ply before it fractures. This means that if you were to “home build” a set of 14’ hulls, the only options that you have are to go with the less efficient, older style ones.
I suppose it all boils down to just what you want from the cat that you sail on? If it is just to get out there and sail/race, then it doesn’t really matter what you sail if you race only on handicap or in a one design class, but if you are looking for the “latest, fastest” performing F14 (or F16) in the world, first start with a set of hulls that you know have the potential.
I am sure that most if not all manufactures of “high performance” 14’ and 16’ cats will sell you just the hulls and then the rest of the build would be up to you