A daggerboard isn't necessary. Many centerboard boats are just as capable of shoal draft sailing, and a centerboard is far less likely to break or cause damage in a grounding, since most will kick up and retract in such an impact.
There are a lot of very capable trailer sailor boats, and some are larger than you'd think. For instance... my boat is a trailer sailor and capable of sailing in water less than 2' deep....but also capable of handling the conditions of Buzzards Bay and the north Atlantic.
If you're looking to build a boat that is one thing, but building a boat takes time, and if you'd rather be using the boat this upcoming season, buying makes more sense. Some boats that might work for you:
The Compac series of boats
The smaller Catalinas, Hunters or Jeanneaus
Many of the trailerable sport trimarans, like my Telstar 28.
Although these are probably bigger than you want or need.
I'd point out that a trimaran is going to be far more stable than a monohull and is also going to make a better fishing platform due to the fact that you can fish from the area between the main hull and the amas.
Yes, you can put a spinnaker on most of these boats...but an asymmetric spinnaker or screacher would be a far better suggestion. An Asym or screacher is easier to handle, deploy, etc.
I just signed on yesterday and after finishing payroll and billing I dug in with both heels and read several of the articles then after dinner started a sailing book I got at the library. I learned a lot, of course anything would have been a lot, and a few things came back to me from all those years ago playing in my neighbors little boat. Now I have a few questions....
I guess the first one is that as I am looking at such a small boat, 12-16 or 18 footer, am I on the right website? Seems most everyone has considerably larger boats and sails more open water. Obviously, being in the Mssouri Ozarks, I'm going to be relegated to inland waters and mostly small lakes. Do you fella's even fool with fish so small as me?
If you do, and I hope so!!!!, do you have any recommendations of particular boats and any makers to choose or stay away from. I guess anything I need to know when out kicking tires.....uhhhh....sails!
As with any new hobby I expect knowing what the wife and I would like to do as "sailors", (and man do I use that term loosely when describing us!!!). Mostly our waters will be as described, inland lakes from a couple hundred acres to several thousand acres. Day trips only for now. Probably taking a friend along occasionally but only two in the boat. I would imagine enough storage for lunches, fishing equipment and the like. Obviously the boat will have to be trailerable. I'd like fast but not interested in racing at all. Stability and ease of operation are the major concerns.
Thoughts on whether fiberglass or wood and perhaps building a sail boat. I've been in construction for 32 years and am quite adept with my hands and have most tools I would need.....I suspect patience is a desired quality and I am that. I am particular to the point of being anal about it. I also already know how to work with fiberglass.
I'm thinking a boat up to 20 feet with a marconi mainsail and jib, a cuddy cabin if I can find one like that. It will have to have a daggerboard due to the shllawness of most lakes we'll be on. Other than that I'm without knowledge.
As an aside....can a spinnaker be put on a boat like that?