We have been building curbless shower for sometime. Almost all our remodels have them and people are willing to cut the slab or drop the joist jsut to eliminate tripping hazard. Here are couple of lousy cell phone pics.
The black and white floor was done for an older guy who had trouble getting in and out of the shower with his wheelchair. After we did that one, Our phones blew up from all his other older buddies who all wanted one. The second is one of our rentals.