So we finished our bathroom with a new waterproof membrane on the walls. It's a super think waterproofer that we slightly water downed until it was a consistency of paint. We used a paint primer first (tinted the same colour as the waterproofer) then used 3-4 coats of the waterproofer. Also added an anti mould solution to the primer. Had it signed off by our surveyor who was amazed by it. I'll try and send some photos.

I think that is our biggest concern - that initially they thought this would look great and work fine and gave us a quote to do THAT specific design, so we did accept to pay more (we had quotes for a more "regular" bathroom before from other contractors for about 4-5K less), then when time comes and we signed everything, they say we shouldn't do this design (which we are thinking is correct after more research); but now we committed to a certain amount of money, which they are not willing to discount to do a much less involved design (tub/shower combo we are now likely to go with). I was able to cancel the tub while it was being shipped without the supplier charging me anything so we haven't lost on that at least! We do not feel very confident and also cheated at this point. I am happy with the contractor I use usually for other projects but this was not something he had done before, so we specifically consulted with a designer to make sure this idea was feasible and practical and hired them as they were confident this would work and the quote was reasonable for this type of design. They also told us they could get materials for us at a much lower cost and stay within our budget, and again, once its all signed, there is no way we are staying anywhere close to that budget, as in, it's gonna be 3-4K more, and that is with picking alternate cheaper tiles, vanity, etc. Very frustrating! I put a link of the initial tub and door we were thinking of using with the initial design. door tub now we are thinking more if the lines of this type of combo combo

@HF You have it. too old too young, not a vet , wrong ' cause' not disease. wrong area, not sick enough, too incapacitated... Goes for most charities. As far as public pools go I can risk it with the compromised immunity . If I catch a cold it can turn into pneumonia in a snap. the smell of chlorine is enough to send my nervous system into overload. We weren't looking for a pool, but this house has one and it's salt water to boot. I'll deal with it being tiny and simple.

@Lars So yeah like most people were saying that conversion can be done, but at what cost. I think 6K gets you close if you do most of the work. Not sure how much a shower pan would lower the price, but for mine, I did have a crawl spaces so accessing and updating plumbing was not that bad. The idea of cutting and moving pipes in a concrete slab is a whole another deal that I am not well versed in. I did all the work all the way up to the professional hot mopping. The shower was then floated and tiled by a pro. I did all the other tile in the house myself, but when it came to a floor to ceiling job, I just designed it and had a tile pro come install, which I am so glad I did. I think I definitely could have done it, but it would have looked like my first tile shower job. He made sure to make the walls super true for a smooth install. Main costs will be plumbing relocation, proper tile job, and glass is also an investment but really makes the whole thing come together. I think your space has potential, and could have a nice stand in shower. Good luck! I have learned to always double to triple my time expectations. Ie: if I think it will take a week to do, most likely will be 2 1/2 weeks. Hahah.