In ,
TimR typed:
On Saturday, December 3, 2016 at 11:35:36 AM UTC-5, TomR wrote:
If you don't mind, could you post back how high up off the bathroom
floor level your 2-handle shower faucet is?

You hit on my worst fear.

The vanity is 32 inches off the floor but it has a 4 inch ledge that
the mirror sits on, so effectively 36 inches.

The shower faucet centerline is at 45 inches.

So I have tight but doable space to work in.

Interesting. That sounds like it will probably work with you just opening
the wall behind the mirror that is above the vanity sink.

But, if you need a little more room, you may be able to get that fairly
easily by leaving the vanity base cabinet in place and just removing the
sink off the top of the base cabinet. Of course, that will only work if the
4-inch ledge is part of the sink fixture. If the 4-inch ledge is part of
the cabinet structure, obviously that won't work.

It sounds like you have this mostly figured out and everything will probably
go smoothly.