I use a compass and scribe lines down the edges of the limbs, as I get closer to the tips I make the gap smaller.
I use the fine side of a farriers rasp and rasp from the belly to the core lam, stopping at the edge of the core lam.
I got a little sick when I came upon a pin knot after removing some wood, have no choice but to keep going and pray it doesn't cause a failure. This is the biggest problem making wood bows, the lams looked perfect till I did the facets and out it popped. DAMMIT...
Got the riser roughed in pretty well, it will be finished at final sanding.