Xin chao anh,
The designer of Tioga was Lewis Francis Herreshoff, mostly known as L. Francis Herreshoff, son of Naval Architect Nathanael Herreshoff, who was one of the greatest of all times.
L.F. Herreshoff designed many boats, and you can have information about most of them in his books: "Sensible cruising designs", or in "The common sense of yacht design" which you will surely find for sale on "amazon".
Plans of TIOGA are available in the mystic Seaport collection, but you must be aware that this (quite large) boat is for very professional construction, and - toi xin loi - the only fact that you did not know the author of this famous boat' design makes one wonder if you are aware of it's complexity.
I am in Saigon. You can call me, if you wish, at 0903 746 147.