Maybe we can stop right here?
Took the day off of work and the plumber Leo is here to install the new tub. We had to add furring strips to the south wall to compensate for the double drywall. We added a new 2x4 for support. We mix a 1.5 bags of cement for the tub bed. And of course the plumber did a bunch of stuff by himself - new copper pipes!
And 6 hours and $750 later, we have a new functional beautiful tub.