I am almost finished with my IPE deck, but I have a question. I am using a two piece cap rail; a 2x4 on edge with a 5/4 x 6 inch top cap. The deck has several non 90 degree angles. On the straight sections, I did a 45 degree bevel on the butt joints with the top cap over the posts, but I am not sure how to handle the 120 degree angles. I would prefer not to use a non beveled butt joint, but it is not exactly clear to me how to finish off the 120 degree intersection if I use a 45 degree bevel for this butt joint.

Any help from the experts would be appreciated. Thanks.