I built a small sailing dinghy about 10 years ago it was a fun and satisfying project. The actual plan I used was shortend/modified version of this Georgia Jeanne
. My local library has his book. You might want to see if your local library has it or can get it for you on loan.
I sailed it about three times turned around and bought an S2 7.3 then used it solely as tender and beer runner in the marina.
I plan on building an Herreshoff 12-1/2.