The short answer is: yes, you can fabricate a tiled bath tub (or even a samm swimming pool or koi pond) in your bathroom if you so desire and you frame it out and waterproof it properly. The details of the construction are critical. You need to have a good structural support (a tub full of water is heavy), and the tub needs to have proper waterproofing and cement/tile work.
I have built one such tub for a (very wealthy and somewhat eccentric) customer who wanted a “Roman” bath built to his specifications. It worked and cost a fortune. So it can be done. I did that many years ago when I was starting out. I don’t think I would agree to do it again, however. It’s a lot of work. I don’t recommend doing it yourself unless you are especially good at the techniques required. You could try talking to some of your local plumbing contractors. Someone may be willing to take on the job.
NtP
