Let them stand in the bathroom and see the bath
A 1700 bath sounds fine on paper. Put it on the floor at real size and the conversation about the door swing happens straight away.
Choose a size
Drag to walk round it
Opens your camera. Point it at the floor.
Once it appears: one finger drags it, two fingers turn it. It does not need a clear floor. Drop it where it fits and judge the size against what is already there.
Will it fit, with room to use it?
The bath always fits. What matters is the strip you stand in when you get out.
Let them scan it and hold their own phone up
The camera view only works on a phone. Point the code at their camera, and this page opens on their handset. That is the moment the idea sells itself.
Standing clearances shown are practical working figures, not a regulation. Approved Document M sets out access requirements for new dwellings. Filled weights are the water volume plus an average occupant, and floor structure should be checked by a competent person on any upper floor.