I'm building a deck and am making a 2-ply 2x10 beam that will be 22' long and supported on 3 posts (approx 9' between posts) So the beam will cantilever 2' on each end with 2- 9' spans between the posts. Still with me? So the issue is that I need to build the beam out of 2-10' and 2-12' pieces of 2X10. I'm tring to figure out the best place to splice the beam pieces. I was thinking of a 12' and 10' piece on one side, then cutting the 10' piece into 2-5' pieces and putting those one each end of the beam, with the other full 12' piece in between them. Then screwing everything together and using splice plates. Sound good?