Best Hull type?
I believe your estimate of the time it will take to build a 30ft sailboat may need some adjustment. I am only a boat tinkerer, but my father was a full-fledged boat builder. He built a 24ft (power) cabin cruiser, and that project took about four years. She was beautiful, solid and seaworthy -- the formative boat of my youth, but she was definitely no rush job. I would seriously doubt that you could get far beyond laying up the hull in the timeframe you propose. And besides, would you want to go to sea in a boat you "threw together"? I wouldn''t.