agd68,
Most of what I know of Native peoples is from the Michigan area (Chippewa, Odawa, Potowottomii, Ho Chunk etc.) You are spot on about the roughing out the bow and then letting it cure (usually on the celing of their Wiikiup or long house near the smoke holes) In this area "spliting" wood was very common (pre-contact). It was so common that most everything they made involved some sort of "splitting" of wood, roots, grasses etc. It might also suprise you to know that their so called "permanent" villiages were "stockaded" (a log wall all the way around). It is my understanding that tress were dropped with "slow-fires" at the base and then split with wedges and stones. They did this for bows, canoe ribs and gunwhales, lacrosse sticks, war-club handles, hardwood baskets and quivers etc. They even split cedar roots for the lashings on canoes. I have a pretty decent pic of a Algonqian bow where you can see that it was infact a squared off "board" so to speak...I'll check on the photo size and attach it to a second post if you are interested?
Eastern Woodland peoples were pretty darned good at splitting wood, the rest of the native peoples I don't have a clue about.
half eye