@NewHouseNewMe could you opt for sliding shower doors?
We have a bit of a tight squeeze in our upstairs shower room as its only about 1300mm wide, the shower is 1100 wide and I was really worried that it would be too tight with the loo next to it, but it actually works really well.
I have a duck board rather than a fabric mat as it feels more hygienic, being just in front of the loo.
My only conundrum is where to put the loo roll holder as if I put the holder in front of the loo it'll get damp when you reach for a towel
current the roll is still sitting on the unit sans holder!