As for where the two braces come together on the post.... It looks like you are using 8x8 material. Are you housing the braces and how much? If each brace is housed 1" and your tenons are exactly 3 inches long, forget 4" long, the but ends of the braces will come in contact and hold the shoulders from the post housings. So adjust accordingly. I favor using 9x stock when housing a full inch so this is not an issue. Not a problem at all, if you plan for the details.

Good luck with the scarf location. It is right there within a few inches.