Guys, I like your idea of installing the waste and overflow first, , and then installing the tub. The problem is that we're installing a 60" 316 lb cast iron tub in a 61" alcove....not an easy task to pull and reset the tub if we need to adjust the wast/overflow alignment. I think I may have a solution: it's a left hand drain tub and the right side wall has a large closet behind it. If I cut out 2 studs and a couple sq ft of drywall I can create an opening through which I can easily slide the tub in and out of in order to make any necessary drain alignment correctons. and since the opening would be in the back of a closet, I could simply cover it with an access door for future use.
I've installed this type of tub in the past in new construction and have had easy outside access to the plumbing through the opened wet wall. This is my first attempt at a remodel and to complicate matters the wet wall is shared with another shower (yep, back-to-back showers). And, the back wall of the tub alcove is the common townhouse wall and I just don't have the nerve to ask the neighbor if I can rip a hole in their living room wall to acces my plumbing
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Anyways, thanks for the advice...very helpful.