My girlfriend, who is handicapped, was having trouble getting in and out of a regular tub.  Luxury Bath Technologies did a whole remodel on the unit and re-did the walls.
They stripped it down to the two-by-fours and then re-insulated. They re-did all the plumbing and all the electrical.
They put in the wall sheets and caulked it out.  They did a really nice job on that whole thing and I was happy with the installation.
Review about: Luxury Bath Bathroom Remodeling.
Reason of review: Good quality.