There's a little more to it than that, but not much. You have to make sure each limb bends evenly over it's entire length and that you don't have one limb a whole lot stronger than the other. And you have to know to make a selfbow's lengthat least double your draw length, plus another 15-20%. And that a flatbow can be made a tad shorter than a round belly, stacked longbow.

I was reading through Hill's "Hunting the Hard Way" again yesterday and was reminded that he recommends a 72" bow as standard for a 28" draw![:-]But that's for a round belly, stacked longbow. I've been shooting a 71" flatbow at 30" draw for several years. It's got some string follow, but not bad.

Rule of thumbfor a decentselfbow is for it to shoot a 10 grains per pound arrow at 100 fps plus the bow's draw weight. My flatbow draws around 60 pounds and has put 550 gn arrows over the chronograph at 166 fps.

Here are a couple of sites for you to peruse.
http://mysite.verizon.net/georgeandjoni/archer.html
http://groups.msn.com/ferretsarcherywebpage

Here's one for making flemish strings for your bow once you git-r-done.
http://www2.pcom.net/jthutten/jth/doc/flemish.htm