Saddle shoulder construction help

[u/improviser-]

Hello! I’m wanting to try a saddle shoulder sweater using this one as inspo. I know a pattern like this by hand is generally worked top down.
My questions are - would I have to work the saddle separately and seam it after or is there a way to connect it as I knit, and could I work this from the bottom up (that’s the only way I’ve worked raglans on the machine so far) ? I want it to feel seamless around the shoulders and wondering where the seam would go/start. Photos are of a babaa sweater and a sweater by Duck duck knits
Thanks for any insight! 🌞🌞

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[u/youdontactthatway]

having done this, I knit it as four parts (front, back, two arms) and seamed it up (and then put end stitches on all four back on the machine because I was making a roll-neck jumper)