Hi Geoff,
you have used a "save selection as object" to make your shower and in the code you have call a "Shower walk in" object that i seem to be missing.
Let's give you some directions:
- you need to script parameters for the geometry;
- some parts need to be stretching only in one direction and be fix otherwise;
- you need to learn how to graphically edit hotspots.
Hope it helps.