Magavin - ah, I know those lights as cage lights! Love your hexagonal tile splashback. Will the mirror extend from the side wall to the shower tiles or be centred between the lights?
Dani j I agree with Magavin, I would get the screens and take them off and store them. Or more precisely I would rather have the openable windows and not open them, than have fixed windows and not be able to open them if I needed to.