John, I am quite a bit further ahead than that; just haven't selected tiles yet. I think I've found a way to do this anyways.
Replace 5/8" OSB with 3/4" plywood throught the bathroom. On top of that place Ditra XL over the entire bathroom; laying heating wire in areas that I want within the Ditra XL. Use a QuickDrain Proline flanged drain mounted on top of the Ditra XL; of course Ditra and subfloor cut out to accomodate. I will also add additional supports, as many as I can, near the linear drain without interferring with plumbing, etc..
Waterproof shower up over top of QuickDrain waterproofing. Tile, add shower glass (sadly it'll have to be custom) and voila t'is done.
I will slope entire floor in shower and tub floor next to the shower from back to front; about a 3/4" difference over the 3' or so. Cut side glass on angle at bottom and then I'll have the curbless shower I need at both the door and the side of the shower. Haven't been able to figure out a way to tile the side of the shower slope if I don't slope the bathtub area as well.
Sound good? Anything to worry about or watch out for? Also, once I finalize the size can you quote me on a QuickDrain? You should be able to PM me on this or send me your email address so I can contact you in the next few days.
thanks,