John,
I've e-mailed to you pdf docs of the engineer's drawing of the area containing the shower, as well as the architect's floor plan of the bathroom. Now that I'm looking at the architect's drawing and the shape of the shower, I can see that it won't be a simple matter of a single-slope floor down to the drain. We're planning for the inevitable decrepitude

in making this ADA friendly and "no-threshold" and I just now realized what the shower's shape and entry point means for the slope of the shower where it meets the entry. I'll have to think about this in relation to the linear drain. I was hoping that the shower floor would be nicer to stand on by eliminating the multiple slopes, but we maybe can't avoid that. The linear drain may not be "best" for us.
You're right that the linear drain is a splurge item. My husband is such a good man and we've both gotten to where we are by hard work and sacrifice. I wanted to splurge a little so that he starts each day with a feeling of "luxury" or "specialness" when he steps into the shower. I'm even willing to postpone purchases such as laundry room cabinets in order to do so. But only if I can work out this floor slope situation. It may defeat the purpose I'm trying for if there's no possibility anyway of achieving my goal of a "smooth" shower floor.
That said, I'm still keen to find the right tiler, since that seems critical to me, to avoid future leaks. If we default to a "regular" drain, I'll still check the experience level of the builder's tiler. I don't want to be an annoyance to the builder or tiler, but neither do I want to abdicate my responsibility to ask for up-to-date waterproofing.
Thanks for input on the Noble vs Kerdi. I've got notes on both, but didn't pick up on the TS part. Glad to hear your support for SpectraLock. It sounds like we'll use it. This is where I need to be very careful not to be telling the tiler how to do his job. I wouldn't want someone telling me how to do my job. But I
do want to ask him what his method is and then I can guide him to my preference, with my questions, if necessary. It may not be necessary, but I won't know until that very moment and that's not the time for me to
start learning.
Dee