I used Osage belly and Osage core on this one. The dark wood you see is a walnut lam I put under the belly so the clamps don't indent the belly wood. The lighter core wood you use, like cedar, the lighter the bow weight will be, so you need to make it a bit wider to get up to better weight with lighter core material. But this bow with Osage and Osage will be up there in weight. The advantage of a tri lam is the pieces are thinner so then will bend much easier when you clamp the bow into a form. So the bow takes on a little sexier deflex/reflex shape. They are much easier to clamp down though, but you have twice as many surfaces to apply glue to. I have used cedar for a core, looks nice. Walnut would be good too and a little stronger than cedar.