Should I use wider boards or shift studs to clear plumbing?

Question

I am looking to put a stud wall in my shower to house the valves and also a few niches, it needs to be a minimum of 150mm deep, so do I use standard 50mm x 100mm (2x4s) boards and offset the stud wall 50mm from the main wall or do I use a wider 150mm board?

I am covering the stud in concrete backer board so I could potentially bridge the gap with that if the wall is offset.

I also have another stud wall that will have a hanging vanity unit attached to it, will this need a double top plate?

Update: Hopefully the crude illustration I've added will help a bit (taken from a birds-eye view of the proposed stud):

isherwood · Answer

You can move the framed wall into the room to provide clearance. Thus is a common practice.
Most interior walls built alongside exterior walls have doubled too plates so wall heights match. Most basement energy and partition walls do not.

Should I use wider boards or shift studs to clear plumbing?

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