As an isometric, I meant something like below. Where the black lines are all horizontal and in the same plane (other than the 1/4" per foot pitch), and the red line is vertical. And where I've drawn LT90s and combos as having a little 45 degree segment to show that they could be (2) 45s or a wye plus 45, respectively. [But where the black horizontal turns down to the red vertical, I drew a sharp corner to show that a quarter bend is allowed there.]
But I'm not saying that you have to do it that way or you should do it that way. Just that if it's convenient to do it that way, it's definitely a normal and correct way to do it. The complication with your original drawing is that usually with horizontal wet venting, when the shower drain joins the drain wet venting it (lav/WC in your case), the outlet is horizontal.
Cheers, Wayne
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