I agree with Bmorv.
If you want to make a really good trilam, use the woods where they're best suited, use the best quality pieces, and size and shape them precisely before glue up. Too often, folks try to use lesser quality pieces in such a bow because they think they can get away with it. There isn't any glass on these things, the wood still has very important jobs to do, so use the best you have.
Don't forget about yew, it's not a bad bow wood
Also hophornbeam, mulberry, maple, etc.
Also, don't look past using Osage for both the core lam and the belly. Boo/osage/osage makes an excellent trilam.