The new sink will be located against the same wall as the shower, at the end of the shower (diagonally across the room from the new toilet location).
Yes the washer drain is low, since I cut it a few years back when I remodeled our kitchen. Since my last post, I'm leaning towards using the washer drain and leaving the shower floor alone ... makes more sense, correct? Will leaving the water trap in the washer drain be an issue? I wouldn't think so, but thought I'd ask.
Thanks for all your help!