Some advise from a lifelong sailor and former USN racing skipper and sailing instructor:
1. Try sailing before you decide to build a sailboat. Some people do not like it.
2. Take some lessons. In sailing, a few hours of quality instruction will give you the tools that you need to safely enjoy the sport. In six hours, I can have you sailing better than most self taught sailors ever will.
3. Buy yourself a beater boat. Something that you can crash into the dock, capsize and run aground with without much worry. You WILL do all of those things with your first boat. Smaller is better because they provide instant feedback both positive and negative. Something like a Sunfish would be a good choice. Bigger boats generally don't capsize because something breaks first. The bigger the boat, the more expensive the break.
4. With your experience, I have no doubt that you could build that boat, but it will be a big/long build. From a sailing perspective, it looks like a lot of boat for a novice sailor. Have you looked at other designs? The number of sailboat designs available to the home builder is bewildering. Look at CLC and Duckworks for starters. You can probably find a simpler boat that will meet you needs that would be a much shorter build.