Don-
take a look at the Isaac Haines rifle (ToTW cat. #16, p.118) i built something similar from a blank and had a great time doing it. if you're not up for making a stock from a blank (they are very labor intensive) you can go with a pre- cut. i am given to understand that ToTW gets most of their pre- cuts from Dick Greensides at Pecatonica. Dick's work is absolutely first rate, and he is very conservative in his wood grading, so if you buy a grade 2, you'll get something a good bit closer to grade 3.
if you have enough sense and patience to try carving on some bits of scrap, you no doubt have the ability to do a good job on whichever style you decide to do.
enjoy the first build, take careful notes, and post photos so we can see what you did!
good luck with your project!
msw