Hi Jerry
I'm building all my models at 1:12 and whilst there have been a number of kits produced over the years for the Huntsman 31 none of them are at that scale. I do have a set of drawings though but I like to tweak the construction, more so with my other builds, and producing the drawings is part of the fun for me. Also I can print out what I want, though with the hull etc. it means joining two or three A3 prints together. Earlier in the thread you may have seen that I have changed the design to the Sport version, for which there are no plans available as far as I know, though there was a kit at 1:48 which is way too small for me.
Are the free plans you've seen for the Huntsman 31? When you say correct, do you mean as a representation of the real boat or from a building point of view?
If you want to build a Fairey then a good plan to start off with is the Huntress 23 available from Sarik Hobbies. The design is by a fellow forum member, Dave Milbourn, and is definitely correct!
Chris