What I've done so far:
I'd say that I have 40% of the pieces lofted. By 'lofted', I mean that I have them drawn up to full scale. I am drawing the pieces onto graph paper, then I'll be adhering the graph paper to inexpensive plywood, cutting it, and then using the plywood piece as a permanent pattern. I think that will be the best way to get perfectly symmetrical pieces for the bulkheads. And, if God forbid, I end up loving this procedure, I will have a stash of premade patterns to start with, saving me a lot of time.
Drawing out the pieces has been tremendously helpful so far, as it forces me to contemplate how everything goes together before I touch a single piece of lumber. Marine plywood, at least the good stuff, is pricey, so I want to be absolutely positive that I know what I'm doing before I even touch the jigsaw.
**********Edited to Add**********I called Edensaw Lumber today and ordered my first round of plywood! 19 sheets; Okoume for the centerboard and rudder, 12 sheets of Meranti plywood (my practice + pattern piece boards) and 5 sheets of 3/4" particle board, which will be my building jig. It's arriving tomorrow!