My client wants this to be HOT. He likes a hot steam shower so the entire bench system including back rests will be heated. I think this will greatly reduce the heat up time for this steam shower.
I will be planning some basic LED lighting and the design shows two hand held spray wands so the user and guest can cool down will steaming.
To keep it warm the design will call for 2lb spray foam. This will allow us to build with 2"x4" framing and keep it toasty. I'm thinking the use of Fin Pan 1/2" wall board over the studs - then 1/2" cement board and then Kerdi DS.