Firstly, seamless shower enclosures/cubicles exist - like a fiberglass box with with top and one side missing, like this one: https://www.ebay.com.au/itm/203754250182
I'm looking for the equivalent of the above, but longer, with a bath.
I have a REALLY skinny bathroom (1.8m wall-to-wall), and it has a bath/shower combo. The sealing between the bath and wall has broken down, and the sliding glass doors are quite old and their plastic fittings are half-broken, so I'm looking to replace the lot.
But I'm after something with no long-term maintenance issues - I don't want to have to seal between the wall and the bathtub. I'd also like to avoid all the "cleaning mould off grout" issues of tile walls. Since seamless shower cubicles exist (see above), is there a similar thing for baths? Or can fiberglass walls be fabricated and joined to a fiberglass bathtub in a way that doesn't leave a seam?
Also, before anyone suggests it, I can't replace the shower/bath combo with a shower-only enclosure. Across the 1.8m width of the bathroom is bath (70cm), walkway (60cm) and vanity unit (50cm). A shower enclosure only 70cm wide may be fine for campervans, but would feel really cramped in a house. A larger shower enclosure would make the walkway too narrow, or require finding an unusually thin vanity unit. It would also require me to move the window, which is right beside the sliding glass doors.
The bath is 1.6m long, if it helps. That measurement can be changed, as the end of the bath is up against a skinny built-in cupboard, for storing towels. The wall between the cupboard and the bath can be moved if necessary.
The closest I've found so far is this: https://buildersdiscountwarehouse.com.au/product/fibreglass-…
Although it has a "high front", it's not a bath. And the 900mm dimension is too large.